there is a limit to units in one tile (25) and I'm like that change very much!, hovewer spies are invisible so why they count to this limit?
Also its strange a little that you need to move one unit temporary, just to put a missionary or great people to city to do its task, this limit should only be true for military units, not civilians (settlers, workers) or other units like spies, great peoples, missionaries etc..
mmmm. kinda like that idea. Limited military, unlimited civilians.
It could even be split up with ships/air/land, though it would require some additional code as well as taxing the turn times.
Btw, I dont think enemy spies count towards the limit, does it?