Hi,
Thanks for your post and appreciation!
"Overlay distance" in SpritePad has only been variable (but same for all sprites) in the last couple of years.
Older versions just had an "Overlay Next" switch in each sprite's attribute.
(equivalent to an overlay distance of 1)
So anyway if you've got a number of sprites that use overlays you should be able to solve your issue by ie. moving all of those sprites to the start of the set, then move all of their relevant overlays (in matching order) to some place further on in the set and use that distance as the universal sprite overlay distance.
So the arrangement you end up with is...
[Sprites that need overlays][Sprites that don't need overlays][Sprite overlays]
you could also use...
[Sprites that need overlays][Sprite overlays][Sprites that don't need overlays]
Basically just keep ALL of your underlays in one big block and ALL of the overlays in another.
ie. Avoid trying to do...
[Sprites1][Sprites1overlays][Sprites2][Sprites2overlays][Sprites3][Sprites3overlays] etc.
You will be severely restricted by the single (universal) overlay distance value when using such a scheme.
I hope that helps.