So instead of having arbitrary grid space divisions, how about setting it up so that the distance is similar to what you get from alt-snapping beats? So, if you alt-snap a beat at .5x while your grid is set up for .5x spacing, then the beat will land exactly one square away. Or, if your grid is setup for .25x, then it will land two squares away. This would also help align sliders, since you could set the grid snapping to a devision of your slider speed.