This tool is very useful. i just have one suggestion and im not sure if it was already mentioned but do to busy schedule,forgive if this was already suggested.
But an added feature That functions similar to illustrator would be great where you an evenly distribute the objects(groups) between a distance.
For example In adobe illustrator you can create 10 boxes and align them to a straight line but then you can equally distribute the spaces in between them based on the box furthest to the left and furthest to the right.
That feature would make it easy to create a patio for instance with a gap in between each 2x4 and have it evenly spaced