There is no denying that the kit making community is part of tf.
However, currently to make kits, the most reasonable way of making them is to go in a solo world to use command blocks to test commands to summon items with long NBT before saving them in a hotbar to import them to TF.
This is rather troublesome because if you are actively working on let's say, a kit, you have to go back and forth between solo and TF, making it hard to interact with the community..
I'm suggesting a command, maybe /longcommand to open a GUI (Maybe a command block UI?) to execute a server command as the player, but without the chat's limit.
If this is not possible due to concerns, I'd like to at least have this command under the name /advancedgive <item> <count> where you could paste just the NBT of the item in the interface.
I also would like to reiterate that this is NOT a way to use command blocks.
This is sending the command as the player who executed it, just without the chat limit.