I would not because coon footed means that the horses foot is hyper flexing all the time. This weakens the tendons which causes the horse to strain his/hers entire leg when jumping because they push off of their hind legs. Injury to sesamoid bones is likely of the horse is jumped or pushed too much. I would stick to pleasure riding or equitation.
Hope this helps!
I would not, you already have strain in placed there should not be strain which means a better percentage for injury in any sport you would want to ride her in. Plus the fetlock would be scraping the ground on take off/landing which would mean putting skid boots on both front and hind for protection from that but you would still have the damage of concussive force
What's causing it and what does your vet say?