@ Asterix:
Yep, Silo is great overall... i use Unwrap3Dv3 after silo, to pack my UVs, but thats because I'm used to it, from the times Silo didn't have UV mapper.
If you're on a budget or, want to learn about unwrapping, i would suggest you try
Roadkill 1.1 its FREE and its very decent

it shows polygon stretching, a useful feature yet to be implemented in Silo.
@ digitalsoapbox:
i love the direction your project is heading!!
Besides REZ, are you thinking about maybe... Space Harrier, Planer Harrier, Panzer Dragoon type of gameplay?
keep it up!
PS: sorry i didn't explain the road unwrap (no time)... but actually there is no magic trick to it:unwrap using LSCM, then go to the 2D UV window, select edge-loops by double-clicking on them, then flatten... repeat until you create a very long straight path, align its bottom part with the texture image and it will automatically tile the whole way up.