You can... but you need to fix the texture map first to get rid of the gaps. The key to the sculpty tool is that your texture cooridinates must have *no* gaps in them.
The default sphere has triangles at the poles instead of quads; you need to re-map the poles to fix this if you want to use the default sphere. The pre-mapped sphere that comes with the plug-in already has this corrected. You can access the Texture Coordinate editor by clicking Tools > Texture Coordinate Editor.
I've attached a picture with correctly and incorrectly mapped spheres that will hopefully make things more clear.
