in this case the settings for the arms squetch property "scale to reach" was set to 100% ...
Thank you Sebastian.... This is one of the tools in Squetch rig that I didn't know... there are so many adjustments in this rig... an impressive/amazing work by Mr. Rigman ( David Simmons ).
Sebastian ... Of course you used arm_FK_IK=ON and I noticed in some sequences the arm stretching when body(hips) moves. Is this behavior a setting up of Squetch rig ???
Nice character Maniac, I really liked it. It have a lot of personality.
about the hand splinage I did a quick fix on it and took 4 splines as you can see in the image attached.
Eliminate the "red" splines and create "green" splines... then you'll have 4 x 5 points patch ( blue ) instead 16 x 4 patches.