All my personal opinion. I am not an old Cinelerra-GG user like most of You (I am using Cinelerra-GG since January 2018 ) and, for me, some shortcuts should be changed (I already speak about). For me there are foundamental shortcuts that a NLE must have, for example J-K-L for PlayBackward-Stop-PlayForward and I-O for In point-Out point. Ctrl+S is good for me and Ctrl+Z shortcut would be welcome. And, I think, the old "Save 's' " could be deleted. I understand the old users but, the old users can do an effort to change (hey!, I no longer have the shortcuts for the old "Move tracks Up/Down"). I think that Ctrl+S for Save is a standard. IMHO some shortcuts could go away and to be available for feature, new or old, more used. For me a shortcut should be assigned to a tool most frequently (or important?) used. For example I would not assign any shortcuts to the following items in File menu: - BD Render... (Ctrl+Shift+D) - DVD Render... (Alt+D) - SubTitle... (Alt-Y) About Speed feature: Very good. Thanks! I noticed that Speed tool must be used with care because the different types of keyframes can upset your work. IMHO, I would have preffered to be implemented at the clip level that you can change with RMB menu on it, and the Speed lines on the track to be hidden. Of course, this way, could not have the Speed Ramp. About F_minterpolate: I have done a short test. On my Charlie F_minterpolate can not work in real time (Proxy without Scaler enabled). I have to use a workaroud. So I can decide if create a SlowMo with FFmpeg by command line or inside Cinelerra-GG: good! IgorBeg