I think the trainer/editor is good as he is.
And you have already an option "Unlimited of Current Item" to darts, smoke bomb, bullets ...etc.
extra pistol holsters allow you to carry more pistols (max is 4) which allows for 4 shots before reloading.
You can't purchase them that I've seen. You can only loot them from the mobs on rooftops that don't carry rifles. They are also on the scouts in boarding missions and on mobs that don't have hats on. It's their primary weapon, you have to pick it up after you kill them.
You can turn on unlimited item after you pick it up and you'll have 999 of them. Most powerful way to take out enemies in the game since it's always 1-shot kill, silent and long-distance. Currently it's slightly cumbersome because after you pick one up and turn on the unlimited items and throw it.. you have to reselect them. It's actually a few button presses per kill to reselect them quickly and re-throw.. definitely much faster than reloading pistols.
[Edited by Bacon Overlord, 11/27/2013 2:57:57 PM]
I'm with DacrazyBeggar, a no-reload option would be great like we had for AC3.
True trainer is great as, is but indefinite sleep time would make the darts like throwing knives since one hit would stop the enemy for good. Just a suggestion I may try to find the dart timer using cheat engine just for the heck of it.