When we open a user's profile, we see the "Kinds of problems XYZ has solved" and we see a question. I think there should be an option for others to try that problem. Some questions that weren't asked in our problem sets but asked in theirs may appear there and hungry minds may want to solve those questions too.
This suggestion is actually more important i guess. I feel the "Request Clarification or Dispute" option should me made more usable. When i click on that button, i see some options most of which when clicked doesn't help me in clarifying my doubt. One says "definitions features aren't built yet" or something similar. Another one when clicked, says "We'll try rephrasing the problem". But i don't think any of the options in the box asks us what our doubt/dispute actually is (Please correct me if i am wrong, and if i am, i apologise). I think there should be space to type what our doubt is and it should later be reviewed by the challenge masters who can clear our doubts maybe through email. I request you to try to implement that as it may help people solve the questions.