i'm not farming for a year, now the games' cards dropping together and faster.
is there any card dropping algorithim changed or this topic help you to figure out what to do? https://www.steamgifts.com/discussion/OxZYh/i-want-to-show-you-how-to-get-your-trading-cards-fastest

my question is for the owner of program but, feel free to comment.

that trick still working for me, just waiting 2 hours for first drop (you know they changed the system because of abused use of return thing) after 2 hours it's all the same.

i can say yes, i redeemed some games last week which includes injustice, don't starve, anomaly korea, and mortal kombat x. actually mortal kombat and don't starve are on my brother's account, i shared my games with him, and used my cs:source with his games, it worked that way too. and mostly i use cs:source because it's installed already.

i tried some indie games like air forte (20mb game) and happy song prototype (doesn't count on steam profile) as second, but it doesn't worked properly for something i don't know.

here is our program (need some turkish, you can figure with experience either) https://mega.co.nz/#!GQUiFK5T!H-GeR_ADhChM6l_6BH1O7azxLJD1gznlG7_XEZnMS7s
(need .net framework 4.0)

actually i didn't tell my friend where i need this program, just tell him i need a program which starts a program, after 10 min it closes automaticly, after 10 min it starts again. so he wrote something usefull but we can say its a prototype. maybe it helps you some how.

how to use:
first, you need to open the second game and refresh the apps tab (çalışan uygulamaları yenile button)
then select the game exe, and copy to game exe file way to there
for last select minute, and click on "döngüyü başlat" which means start the loop.
it works with l4d2 good at first then it closes i think it closes because it opened the game from the exe file, not in steam library.

i'm still using this method right now. you can see the cards which i dropped until now on my inventory.
i have still 100+ card drops on cs:go, so i started idle master for simulating cs:go, then wait 10 minute (maybe 9, maybe 11; until the card drops, but if it doesn't dropped that means you need to open the second game and wait to drop) so i start and close like i wrote, still working for me.
actually i'm trying to detect the drop time as second, sometimes it is like 9 min, sometimes 10, sometimes 11. it need to be checked properly to find out the pattern. (need some timer program which starts with the second game and stops when you close it)

i tried this with left 4 dead 2, it works too. but when i use it with a automatic exe opener and closer program (which a friend of mine wrote for me) l4d2 closing after 4-5 min itself, i don't know why. and i can't use my program for automaticly open/close with cs:s, because i need exe file, but cs:s uses hl2.exe so when you click on it, it show an error. also i said it doesn't work properly with non-valve game because i tried many combinations of games but it's not working good with my own program, maybe it's program fault, maybe they will work too when you use them manually, i didn't tried this.

besides this all, when i use with manually opening and closing. i'm %100 sure it's working. i'm using this method for weeks. and i opened a topic on steamgifts (link is on your topic) people said it works for themselves too.

First, you need to start Idle Master as usual.
then you need to wait around 10 minutes for the first drop (if doesn't drop, it means you already dropped)
then you need to open a second steam game manually, and wait another 10 minute to drop another card. you can turn to windows until waiting.
after the drop, close the second game (don't close idle master)
it goes like this. open second game - wait 10 min - close second game - wait 10 min - open second game.

so you don't need to wait 30-45 min (on cs go, it goes to 2-3 hours some times)

i prefer cs source as second game, because its works every time, i get cards more than 300 like this way.
if you don't have cs source, try something from valve. i don't know why but it doesn't work all the time when i use non-valve game.
also i need to say it's better the second game don't have trading cards. maybe it cause confusion.
last one word about vac ban, it's your fault to play vac games while using idle master. just open the second game, not play.

actually i found this trick myself (maybe you found too) and use this manually open-close for a long time. it's tiring thing to follow after many times, so i want to set this system at night and it works for all night automaticly, morning you get a lot of cards i guess. so i talked to my friend to write a single program for automaticly start a game, and close it and continue the pattern. but it doesn't work all the time. it needs to improve better way, so i don't want to publish the program for now.

also i added the guy who wrote Idle Master for telling him to add this trick for next version of the program.
i hope it works for you all. happy farming.