Mocap Animations editing or creating variations?

Hello,
Retargeting is currently not a big issue but editing the animations to create variations or fixing foot slide is. Currently, i reanimate the legs to fix the foot slide. Cinema 4D has the perfect example for this here

Is there anything in blender currently that can help with that?

I saw this addon which could do it but its in development and i could not get it to work… hope they put a tutorial out soon… Forgot to add the link: here