Try this:-

• In the hand section edit the scale channel to read propagatingScale
• Edit the name of the dial if you want a visual reminder
• Load the figure and scaleALL the hand
• Use the forearm Taper dial to get a match up.

No adjustment of finger joints required. Grasp and Spread dial still work.

Only thing I could not do was make this into a pose file for existing figures. This was because you can not change the internal name of an existing channel. Injector poses rely on there being a blank pre-named channel available.