Hi Oskar, you could also try 3D-Coat or ZBrush for altering the geometry instead of doing UV textures, if you have an area that is difficult to set up good UVs for.

Here's an example from a while ago where MoI was used to do some basic shapes and then ZBrush was used to add detailing like knurling on the sword handle and embossing on the shield:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1045.1

But definitely 3D-Coat and ZBrush come to mind if you're looking for a general way to add detailed lumps and bumps to a model.

- Michael