I've experimented with this in WoS2, here's what basically goes on:
You have the average RPG with a computer-controlled town, spells, items and what not. You can enter buildings, buy things, etc. The twist is that you can enter the Town Hall and replace the computer as Commander. Your RPG hero is stuck in the Town Hall, but the entire town (buildings and units) is now under your control. Minerals are swapped so you can still continue later as your Hero. For balance purposes, all the units have uber low attack powers, so the other human Hero players can still make the difference. So that power will not lead to corruption, an Overthrow option is available to kick the Commander.
Since WoS2 never got too popular due to the extreme confusing interface that haunts my entire my WoS series, this innovative feature never became too well known.