I too was going to suggest the frame scrubbing feature, thought I’d add my thoughts to this thread:
In a program I worked on, while the user held a key down, just waving the pen back and forth (without pressing down on the stylus) would roll the frames; right or down movement == forward, left or up movement == reverse, and on release, would return to the frame you were on before scrubbing.
This really is great for productivity when repeating the common paper process of (a) rolling a few drawings, (b) dropping in a line, (c) repeat..