Seconded.

Agree. It's practically unusable for storage buildings with 1200 capacity. It takes literal ages to set anything.

Agreed.

Personally I'd just like a text input button in between the arrows that I can click and type in the number I want, but at least shift modifiers to change the capacity by 100s would be nice.

Also, I'd really like for there to be a way to copy a preset from one storage to another.

+1 need a way to do it faster. Having increment of 100 would help, but still be tedious in my opinion since there is 13 resources that need to be set. Need a way to set all resources at once or copy settings from another storage.

Better storage management tools would be great, I find the most annoying part of storage centers is how hard it is to customize them. Having easier ways to set minimum and maximum stocks, and maybe even being able to see all storage centers in one spot (such as in the buildings list) to gauge overall storage would be nice too.

i would actually prefer an option to just add a button to remove the option that items of other categories simply cant be stored anymore , giving us the option to fill the whole storage with one ressource only or specialized storages (like the ones from surviving mars)

I would also like to see that Storage Center being not configured after it's creation because just a millsec after that Bots are coming already with item even when you stop the game directly at that millsec after it was build. Now we should be able to set the SC's storage options like what should be stored and how much should be stored from that item until it's current capacity limit. Next would be an upgrade to it to rais it's max capacity at last.
It should also include everything the OP stated here.