From the next update (V1.30n-D or V1.31n, whichever it ends up being), the default setting will be fixed keys. For this, F3 to F10 will match the layout for DOS / traditional Lemmix (ie: F3 = Climber, F4 = Floater, ... F10 = Digger), while the number keys 3 to 0 will be used for the new 8 skills (3 = Walker, 4 = Swimmer, 5 = Glider, 6 = Mechanic, 7 = Stoner, 8 = Platformer, 9 = Stacker, 0 = Cloner). There'll be an option in the Config menu to use the positional keys instead (F3 = first skill on the panel, F4 = second skill, F5 = third, etc, rather than the keys corresponding to specific skills).