Kind of like a 1/10 4WD TC right Big House?
Kind of unrelated, but my truggy has a carbon-fiber "spine" so to speak as Big House described, and it has done a great job reducing flex (especially since it's the 6061 RTR chassis, not 7075 Pro). Diggity Designs makes a similar item for the Caster buggy:
http://diggitydesigns.com/D3_Caster_EX_UpperDeck.html
I spoke to Damon about using setups like this, and he said with the reduced chassis flex you will have to change the suspension setup a little, but overall it will be more consistent. You still need to have a little flex, but shock oil and springs are more predictable than a flexing chassis, and they should be doing the bulk of the suspension "work". And especially with a TC I think a stiffer chassis is the way to go, since the surface is smooth and high traction.