Objects on Path construct has several on-canvas widgets, allowing us to quickly eyeball some parameters interactively.

One of these is the starting position of the array along the path.
If the length of the array is shorter then the path, we can grab the rhombus marker and move all the objects together along, keeping the gaps.

Another one is Space widget, which is located above the construct.
We can grab and make all the gaps shorter or longer at once.

For some reason both treat the array as directional.

We need an ability to be able to move the array and scale the gaps from both sides, not only from on 'starting' object.

Please put another rhombus marker for the last object on path as well, and make the two Space widgets next to first/last objects instead of above them all.

(Originally by René Andritsch)