Infuse has a feature to de-/increase the playback speed.
At the moment you have some predefined speeds (in +/- 0.25 steps).
I usually take an increase of 0.10 (1.10x), because 1,25x is too fast for me.
For this I have to navigate 4 x up then 2 x right to increase 2 x 0.5 to 1.1x.
I think this layout would be better, more flexible and most importantly easier/faster to choose the speed you prefer (sorry, I mean, really sorry for my bad Photoshop skills ):