Yup I've tried this but I think I'm doing it wrong, because it's not working well... I've set it like this (well, other ways too but mostly this one) :
On Keyboard D is pressed, spacebar is down, platform is jumping
---Set "dash" enabled
On "dash" enabled
---Set platform angle to (something) ? I've also tried max fall speed to 0, and some other things, but it's always weird...
---Set platform vector X to (something)
---Set dash disabled
Am I forgetting an event or action ?
Edit : I added a "Wait" action and it seems to be more or less working, but just horizontally. When I'm trying to dash vertically or diagonally it's doing weird stuff.