No way to slow down an animation part way through

[foxharp]

I'm running the linux appimage version 4.1.9.

There is only a "go faster" button in the animation. So you can't go from 4x to 2x. You can try to accomplish this by going successively faster, and looping around: 4x to 8x to !! to 1x to 2x, but since !! is infinitely fast, the animation finishes before you can slow it down.

There should be a "slower" button ('<<') in addition to the existing "faster" button ('>>').

This is clearly related to #244, especially if one could select a new speed while paused between operations.

[foxharp]

And, while I'm at it: the !! "speed" should be replaced by a ">>|" button, to be symmetrical with "|<<". Then, at least, the cycling forward through the speeds, as described above, might work: 4x to 8x to 1x to 2x , at least if one were quick enough on the mouse.