Shape Layer - Incremental Repeater?

I think I know what you're after, and the Repeater doesn't quite work like that, unfortunately. 

If you're working with relatively simple shapes, you can do a lot of this stuff with text animators, which give you a variety of ways to approach the spacing & more individualized controls per-character if you need it. 
https://youtu.be/plbsdkRhy8g

If this isn't what you're after, if you have a screenshot of your intended design, I'd be happy to help with other suggestions! 

I'm not clear what you mean by "incremental spacing".  All values in a repeater are uniform and absolute based on the repeater's transform property group. Everything outsiude that would require a differernt approach like nesting multiple groups and transforms or duplicating shapes manually. Anyway, it's realyl not clear what you mean, so provide a better explanation of what you are actually trying to do or struggling with, including screenshots.

Mylenium