I am with heddheld on this one.

Bump and displacement maps are rather simple grey scale maps and a lot more end user friendly as normal maps.
Just open in any paint proggy, and adapt / adjust when required.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!