This was something that annoyed me in GalCiv II . Pressing Skip turn on a unit consumes all its remaining action points. Sometimes I would change my mind or pressed space on the wrong unit by accident and it always resulted in me being annoyed because there is no turning back.
I would suggest that the unit goes to Sentry until next turn instead. This way you can still come back and move it before you finish your turn if you want. Many TBS use a similar system and it plays very well. I see no reason why we could not have that in GalCiv III.