Objects on Path needs more options and in its current setup is very limited in its usefulness. This tool feels like it's still in beta. Whilst it's good at doing the one thing it's designed to do, it's missing a lot of useful capabilities.

What's missing is the ability to keep the baseline of the objects i.e., keeping the objects horizontal. What it needs are the same options as Type on a Path (Rainbow, Skew, 3D Ribbon, Stair Step, Gravity).

Other two requests are:
1. Allow to nudge or rotate individual elements along the path for Objects on Path — http://illustrator.uservoice.com/forums/333657/suggestions/48987899
2. Add an option to measure gaps between objects in Objects on Path by their bounds, not between centers — http://illustrator.uservoice.com/forums/333657/suggestions/48987905