Shared Stash is extremely dubious. You need to be sharing a square with an ally for that to work and if your ally is sharing a square with you I'd probably let you take items out of their pack without any teamwork feat. Really, the
"retrieve a stored item" action never specifies that it needs to be your own storage and neither does the
Quick Draw feat, so if you're drawing items from the storage of a friendly PC sharing the same square as you, I'd probably let you just do it without any ridiculous teamwork feat. This is starting to look like the
Strike Back or
Cleave Through feats which allow you to do stuff that sensibly you should be allowed to do anyway. Probably belongs in the bad PF feats/etc. thread.
Sly Draw is handy. Always Threatening seems largely pointless, as any weapon you are drawing out of a bag of holding is effectively already concealed. Mythic Quick Draw is a ridiculous way to reobtain the ability to draw anything like 3.5's Quick Draw feat. But on that note the
Underground Chemist rogue can also quick draw alchemical weapons without needing a casting of the
Quick Throwing spell. Really, Jason Bulmahn's moronic Quick Draw nerf in PF core only served to make alchemical weapons largely trash, but that was pretty much his intention, Paizo being Paizo and all that.