assuming y shock you mea front suspension forks, then yyes, the geometry of the frame is altered to allow for the highter front end. just buy a fokr with lock out - best of both worlds. not sure wy you don't like shocks, it like saying you like a 6 inch black and white TV in preference to a 42 in flat screen high resoltoin colour TV.
An XC mount designed for 80mm travel will be fine with a rigid fork, no need to carry the extra weight if you don't need it, if thats what the OP was asking tho' I'm still not quite sure it was 
assuming y shock you mea front suspension forks, then yyes, the geometry of the frame is altered to allow for the highter front end. just buy a fokr with lock out - best of both worlds. not sure wy you don't like shocks, it like saying you like a 6 inch black and white TV in preference to a 42 in flat screen high resoltoin colour TV.