I'm hoping that we'll be doing custom cables and cable in general pretty soon. I've been putting it off because we've been so busy. I know everybody is dead set on LMR400, but there's equally good multi strand flexi cables out there that have pretty much the same specs, but are a lot more flexible and easy to work with. That's one way of avoiding the physical issues of a large single center conductor cable. But the flexi type still might be a little too much for a handheld. RG8X is nice and flexible for patches. That's what I would use otherwise.
Dave
http://www.dpdproductions.com/
Antennas & Accessories for the RF Professional & Radio Hobbyist