I would like to propose a feature where you can have an option to submit solutions to problems in contest when it is ongoing and not participate in it. This is needed especially in some challenges where you would like to test out your answers for some problems, and you don’t want to enter into the ranking list. This would save from not loosing out on ratings as you didn’t attempt other problems.
Similar to this, it would be awesome to have a virtual contest feature. Similar to what we have on codeforces. It helps out on preparing for short contests.
And many thanks to the quality problems and editorials codechef posts. Great work guys!