Have one of your mercs walk a longer distance than
his/her action points will allow (like 80 or so).
Watch the merc's action points as they decrease.
When the merc's action points get below the amount
usually needed to shoot (but _not_ to zero), right
click on their picture to spin it around and get the
Click on the "reserve points" button (I believe it
has to be unchecked before this little cheat is attempted).
Then right click on the picture again to spin it back around.
The merc will continue walking (as usual), but he/she will
walk _all_ the way to wherever you told him/her to go, with
absolutely no regard for action points.