Hello.
Basically it would be the same for feet as hands.
My idea is adding a "grab/sticky" feet mode, so that if you want to jump, you leave grabbing mode turned off, if you want to extend knees just to stand up, activate sticky feet by clicking on feet or pressing a shortcut key, could be B in case its not used.
I think this would bring a lot of posibilities.
I hope you like this idea, both to players and devs if they read this.
PD: it only would work with floor, not for grabbing other players.
That should only be able to do with hands.
Thanks for reading this.