Gates are planned. Although I'm still trying to work out how to make them useful, because I have a feeling they'll be torn down so frequently by monsters that players may not build them in favor of building additional towers instead. Another important note is the "Wall yourself in completely" strategy won't work in the future, because the monsters will just start tearing down your walls instead of being bottle necked to one point so you can kill them with towers and other defenses. Thus, walling your villagers completely outside your village by accident actually shouldn't happen hardly at all since walling yourself in completely wouldn't be a viable strategy anyway.
Either way though, I'd like to add gates so the bottleneck points can use gates as slowdown points and you can blast the monsters while they're stuck trying to pound down the wall. I just have to make it balanced, so players aren't motivated to just build more towers instead.
The button will actually be moved to the work tab (Left hand GUI), it'll work like how traditional RTS game's sell buttons work basically. You'll select the "dismantle" tool, then select the various objects you want to dismantle. It's a somewhat more safe way to remove the need for the warning box (That was originally planned) so that you can dismantle large amount of objects, like sections of walls, quickly and easily.
edit; Aborting the dismantle, effectively converting it into an under construction building at whatever equivalent stage it was at when it was dismantled, is also planned.