In freemove, walking to any location ends the round. If you redirect during travel, it does not... Only when you actually hit your clicked point.

Reinforcements shouldn't be timed... They should be on a round counter. Perhaps even a randomized round counter.... So you. Don't know when they're coming... Just that they are coming...

yay python! Though I'm still miffed by the changes from 2.X to 3...
The logic itself is straight forward enough... its more a matter of how extra complicated the editor makes it.
I'll have to save that for the balancing pass most likely. Or possibly just have a maximum enemy count (which would play into adding difficulty levels in the future)

Maybe something like this ? (Python-alike syntax, yay)
if Fighting:
__if amountOfTurnLeft <= 0:
____timeOut = true
else:
__if timeLeft <= 0:
____timeOut = true
if timeOut:
__// Spawn the drone

Out of a fight, I think pretty much every movement click is a turn. I believe the cemetery is turn based so I would click aimlessly when I was trying to text the ghoul spawning logic.

I'll give some thought to the reinforcements. And look at the bright side, you confirmed it worked for me

The thing is to wonder how will the turns work out of a fight.