I'm working on the ground-reach feature now, and what I really need are side-view images of you guys on your bikes with both of your feet on the ground. Obviously only one foot would be visible but it's important that the bike be upright, not leaned to one side, which is why I suggest putting both down.
The way this will have to work is I'll have to come up with a minimum leg angle for each bike to compensate for the effects of seat width and shape. So a dirt bike might have a near-vertical minimum angle but a cruiser would have a more angled one since its seat width and dish would make it difficult or impossible to put your legs straight down.
However there really is no way for me to come up with this angle except by looking at actual photos for reference (not for each bike obviously; the same angle can be applied to similar bikes based on one reference).