Units would leave behind block scrap heaps, which could be harvested back (for metal, one of the 2 resources).
Excellent idea. I like the idea of recycling for raw materials, or, if you know how to use it, there is potential for parts to be salvaged as well.
With additional fire, the scrap heaps would crumble, clearing the way, but also reducing the salvage value.
Also a good idea. Scrap heaps or disabled vehicles could be blown up with rockets/tanks, etc... to get them out of the way. or, prevent capture for studying the techs.
When a robot is destroyed, those pieces scatter on the battlefield. Another mech could come and grab the arms and utilize them right away (Laser Sword arm, homing missiles launcher arm, etc.). Other pieces need to be brought back to base, researched, reverse-engineered, then you can use enemy's technology against them.
I definitely like the idea of usable parts. For instance perhaps tanks and other vehicles have optional weapon bays, which you can pay to have something their, or upgrade these ports. That would be quite nice that a tank, if their mechanic has the skills, could collect and attach these additional features.
Don't know if this is exactly an answer, but CnC Generals had something like that. The GLA faction had a hero unit Jarmen Kell who had a snipe ability, which would render any vehicle unit neutral, and which would then be captureable by sending any infantry unit into the vehicle. And you could theoretically have an infinite number of neutral vehicles, although it was rarely so, since players would try getting those vehicles for themselves as fast as they could
This is good, having weapons or troops with skills to disable instead of destroy. like turrets for instance, not just vehicles. as this would allow you to take over a turret at the edge of an enemy base, using their own weapons against them.
Moltar - "Do you even know how to use that?"
Space Ghost - “Moltar, I have a giant brain that is able to reduce any complex machine into a simple yes or no answer."
Dan - "Best Description of AI ever."
My Game(s), Warp Wars is in early development and can be found here: http://blog.WarpWars.Net.