Opfire Filtering; plus other questions

[Gerry1]

I made up a small battle and I have some heavy infantry with 3 x 50mm mortars. In the CD version could I set a filter that would stop them firing their Mortars in the AI's player turn?

Or is there another way to do that?

Also in the tutorial I had trouble with the W command. I couldn't get it to work on the first shot. If you want only a certain weapon, say a MG to fire, what is the sequence of keystrokes to get that to happen on the first shot? I seemed to be able to get it to work on a later shot.

Thanks in advance.