Make modoption mo_impmulti permament!

[ZoneTrooperTA]

Im amazed of the gameplay and physics with this game option.
I would like to see this option be hard coded at 2.5 or 3 or be default
It adds great taste to game!

Thanks !

[skymyj]

Atm, it will stay as an option for 2 reasons :

• there is a lack of units missing.
• some players complain.

But, I think, we could create a new weapon type to create impulse.