MARROW FRENZY

[Riccioli d'Orco]

Hello everybody i know this game's playerbase is basically absent these days but i'm hoping a little bit.
I've started replaying this game because is tons of fun and really mice BUT i've got some issues with keymapping.
First, how the heck do you even keymap?
Second, how do i map marrow frenzy to a key?
I'm using a keyboard btw and i finished this game a couple of time with it back in the day

[WarriorTomb]

Author didn't added key for marrow frenzy. There is no update since 2016.
Propably he left game alone.