Well I have been busy and disapeared, so I pull the latest version of ufoai from svn and this problem still persists .
Oh well.
Actually it was fixed a long time ago - Its an option in one of the option sub-menus, could you not find it?
If you really get stuck I'll try to come up with a screenshot of where the option is.
Or, did you find the option and find it doesn't work?
Edit: I see that Mattn replied at the same time I typed my post - Hopefully you now have enough information to adjust the game to your liking. If not, or if the option doesn't work, please let us know.