Sometimes you just need to reduce your population but the only ways are to either rush a room repeatedly until the dweller dies from repeat failures or send a dweller to the wastes with no equipment, stims, or radaway and wait for them to die. Neither of those are very good methods. To that end, I suggest the following.

Banishment: You banish a dweller to the wasteland to never return, reducing your population by 1 for every dweller banished. Banishing a dweller does have the negative side effect of slightly lowering the happiness of other dwellers so be careful of banishing too many dwellers too quickly lest your vault fall in disarray.

It's been suggested many times before, its been ignored.

booo

I luke it http://40.media.tumblr.com/tumblr_m8mwolHNS31rcnsvjo1_1280.jpg

I agree. How about a "Tell a waiting dweller to F OFF!" feature?

Sadly, our 200 dweller limit is most likely due to the sloppy 3D engine that dies once it's involved. This game relies on ragdoll 2D animations projected on flat polys. It's the slowest feature of most 3D engines, and evident in this game. The artists have done an amazing job giving the vault world a rich environment, but it's too bad it kills the game's performance. At first I thought it was due to slower devices, but after playing the game on numerous devices from iOS to Android, phones to tablets, it's official...it's SLOW!

I've been pushing for a 2D mode to speed the game up. Never invoke the 3D engine if so selected in the preferences. I have a vault using all the floors, and it's apparent that the engine could easily handle another 100 dwellers without additional problems. Why this game is 250 megs is beyond me. The assets are being stored as bitmaps most likely, and not vectors. If they would revert to SVG assets, the game would reduce to 50 megs.