There have been suggestions (e.g. by Bloodsong) about cross-welding the fingers by text-editing extra Weld commands into the CR2 file. But in my Poser 4.0.3 that technique often makes the rendering act weird. What is needed in any forthcoming Poser 6 would be a way to tell Poser to insert twist and joint and smoothscale channels (or similar) (as well as extra Weld commands) between any two parts which are not direct parent and child.