Built in movement in MMF2 is quite a bad way to go in terms of a fan-game engine. You should code the engine itself, X and Y axis.
To do the movement "without floats":
Set Xposition "Active" to Xposition "Active" + AlterableValueA.
Alterable value a can be named something like Xspeed/X_vel or something
"Active" is the default name for an object, should probably be called, Mask, Player, Mainsensor. Something like that.
You can then control the said value of AlterableValueA and make it move only on it's X axis.
Just repeat this process for the Y axis and you should be good to go. Assuming you know how to edit and change Alterable Values.