Spring RTS Engine

This is a good one, load a map with water and build a crusader, take direct control of it move out into clear water and fire your weapons at almost a verticle angle,, just a few degres off, the torpedoes launch out of the water like a polaris and when they come down they bounce around on the water like some sort of novelty beach toy .

While in direct control, how to change weapon?
For example it says commander has 3 weapons, how to change on weapon 1 for instance or does it use the best weapon always?

I looked everywhere but I couldn't catch that thing. Also there aren't keylist from the direct control...

You can't. Hit the fire button, it tries to fire all the weapons.