the system should allow the units to go down ANY slope,
And if the units meet a 90-80 degree slope then? what, will they stick like glue or kamakize jump down? (just askin, not flaming)
The realitic thing to do is to have it like it is now, whit some minor changes... like vechiles can go 5-10 more deggres up a wall. A system where you can climb anything at any speed is stupid. we could as good have completly flat maps for that... Btw are there any speed boost for tanks when they are going downhill? it should be a major strategic benefit if a major speed bosst when going down sharp slopses.
As for pathfinding, it diffrent for evry unit (or type of unit) right? Then all vechiles should think of evry slope bigger then 2/3 of their max climing abilty a nonshortcut, and evryting over a wall. ( this is alredy in pathfinding or what? am i just rambeling here?talking to plant or something?)