Ok so when I first installed this addon for a DarkRP server a year ago, there was an issue where as soon as you picked up a gun from this pack, your run speed would be set to 500 which is the standard Gmod run speed. However DarkRP runs on a slightly slower speed.

Using the packs settings in the Q menu didn't change anything, you could go and change the files to manually configure but that's messy for updating. You could also run a command to force the mass of the weapons off but I could not locate that from a friend.

So I tried a few settings via the ULX rcon and lua commands and I used the commands Siminov added in.

sim_run_speed 310

This seems to fix the speed to a normal DarkRP run speed.

Re-create issue:

1. Enter a server with the addon in it.
2. Spawn a gun and hold shift to run, you should be running quite fast (e.g. not like DarkRP default)
3. Run the command in ULX (or Rcon) and respawn yourself.
4. Pick up the weapon and hold shift again, you should now be running slower.

I tested this by making run speed 150 (slower then walking) and 999 (really fast lol)

You need to set this anytime the server has restarted but i'm yet to see if I can set this in a autorun/server config to automatically do it.

I note that the police boost they get by default in DarkRP will be over-ridden if you use this pack and these commands, so police end up running the same speed if equipped with a pack gun.

Hope this helps :)