Over time there's a few crags that you get a whole load of ascents at, be it your local or somewhere you visit regularly.
I think it would be really useful to have a feature that allowed you to hide / filter your successful ascents at a crag, allowing you to easily see what you have left to tick off.
Even better would be to incorporate this into the 'view (or hide) your partners ascents' to view mutually unclimbed routes that you can do together. A great way to find routes that neither of you have done without the back and forth of route suggestions with one person having done it previously with someone else.