When you press "B" while controlling an actor, you're supposed to enter bunker building mode. But nothing happens. And nothing prints to the console.
How wrong is this?

Setting the game back to bunker build mode doesn't work once you've pressed done before.

If I just press "b", it acts as if you have pressed "done". If I press and hold "b", it goes into and stays in the bunker editor. But it's slightly laggy.

That's because the game is starting the bunker build stage and then exiting it in rapid succession. If you try this on a level that starts without the bunker build stage (e.g. the brain is placed ahead of time), it will work once. Obviously there is a variable that dictates whether the "Done" button has been pressed that is not reset until the game restarts.

Is it possible to reset the count for "done"?

Not that I know of. I'll check it with data some time.

Cool, thanks. I guess for now I just have to deal with holding down a button and getting some lag.

Also, I checked everything on the Wiki for Lua, and most of it is empty. I think that should be a priority on the to-do list.

http://www.datarealms.com/wiki/index.php/LuaDocs/Index
Probably should be closer to the front page, though.

I see nothing about activities.

It needs to be transferred from Data's documentation, the description cleaned up, datatypes of arguments added, and an example added. For each function.

Data apparently didn't Document the activity or UInputMan objects.