I was looking at hitbox manipulation and came across FlxSprite for Haxe.
This part caught my attention:Scale(FlxPoint)
Change the size of your sprite's graphic. NOTE: The hitbox is not automatically adjusted, use updateHitbox() for that (or setGraphicSize()).
// twice as big
More here: http://haxeflixel.com/documentation/flxsprite/
I was curious what type of Haxe flowlab uses, if it were relevant for changing hitbox size.@grazer
If you find a solution, please do let me know, it would be very helpful to do something like this.