Hey, 
While working on some things for my community, we had an idea about saving certain items to kits for a roleplay reason on NPCs. However the item name is not normally saved by the plugin currently. Working with it for about an hour, I added in the functionality for names to save, but think it would be a great addition for the plugin with only about 2-3 lines of code adjustment. While I have only tested it briefly I got no builditem errors and the data saved to the kit file with no issues. Not sure if I should post the code or not please let me know.

That would need a permission would"nt it ? , and would you have to have that "kit" inventory equipped to save to it or would you have to name the actual kit you wanted it saved to ? , If there is no permission would you run the risk of unauthorised players saving almost anything to any kit they were entitled to redeem ?, or is it only for NPC kits ?.
So many questions and so little time  :)

No rusts native Item has item.name however it can not used in conjunction with creatitembyid. All I did was add a call to the item.name that I'm now saving in the data file for each kit. No permissions have changed at all. it does require a separate plugin for the name change. but after you change the name of the weapon say an lr300 to bingo the kit plugin saves that data along with skin data and other things. Then when the plugin loads the kit onto the player it calls the name for item that was saved to the data file, and changes the item name via item.name and gives it to the player. There is no check for authentication because this is only run when the plugin has already checked if the player may access that kit.