AFTER DOWNLOAD, PLACE THIS .zrd FILE INTO THE "keys" FOLDER OF YOUR MECHWARRIOR 3 INSTALL
This is the control scheme I use when speedrunning.
The main points are as follows:
WASD movement (W=forward throttle, S=reverse throttle, A and D=turn left and turn right) Centre torso to legs=C
Jump jet=space
MASC=V
Torso movement/torso twist=mapped to mouse
Toggle torso mode=middle mouse button THIS ONE IS EXTREMELY IMPORTANT FOR SMOOTH/FAST MOVEMENT, THIS IS HOW YOU SWITCH BETWEEN TORSO TWIST AND FREE AIMING
Fire weapon group=mouse 1
Change fire mode=mouse 2 (note that almost all my builds use only 1 weapon group, so it's more important to be able to easily switch from chain fire to group fire)
Next weapon group=B (for the few instances where you do use multiple weapon groups)
The rest (targetting, Lancemate commands etc) are just the defaults. The default control scheme is quite overwhelming, but most of that stuff isn't really needed for speedrunning, so things get easier when you focus on only what is necessary.
Hope this helps!
~FG