It be cool if there was a mate feature, under align objects.
Lets say you have 2 boxes:
and you want the two inner edges to meet (useful for things such as tiling..) Theres currently no easy way to do that, you'd have to get the x of the first box, add the width of the first box to it, and then move the 2nd box to that location. But if theres a mate feature its as easy as select and click mate and boom:
Hope you'll consider it