I just realized there is one.
ALL.THOSE.YEARS.!111
So for anyone as dumb as me not seeing that button and moving ui elements pixel by pixel all the time, try to have a look at this:
The grid spacingcan be edited under layout.
*bangsheadagainstwall*
Forum topic · General Scripting
Visual Maxscript Grid Snap
By br0t · 2012-10-31