I ride on the rollator & my husband pushes me. However this means I have to keep my feet off the floor and in the air and that hurts my back and hips. We put a broom handle between the front bars and now can rest my legs/feet with it. It's a big help to me. Think about it and check with owners. Perhaps an idea to send to your engineers.
Silver sneakers showed us how to use the cane to get up if we fall. How to step up brick steps. It’s helpful beyond walking.