IgorB/Pierre:  a compromise has been reached and the latest GIT checkin includes the following change for the Ripple:

the Ripple tool, it should behave as before when
it comes to adjusting a cut from the beginning of a clip.
It now behaves as before.  Edge is changed to be what 1/2 of the Ripple was until now. 
 
The Slip tool remains the same so that there is no confusing difference in behavior with the others.
The Roll has never been a problem.  gg/Phyllis

New test builds are at:
   https://www.cinelerra-gg.org/download/testing/cinelerra-5.1-ub16-x86_64-static.txz
   https://www.cinelerra-gg.org/download/testing/cinelerra-5.1-mint18-x86_64-static.txz