Maybe this has been requested before, but a cursory scroll didn't yield much. Can we enable custom lists (other than just the to-do list)? Top priority is personal lists (e.g., "lifetime boulders" or "sport routes that shut me down"). Something cool would be public lists associated with areas (e.g., "Michael's list of red rock dynos").
I would appreciate something like this. I've been thinking a lot lately about how Mountain Project could use some sort of custom metadata support. Route descriptions can have details like "this route faces north", "this route is overhanging", "this route is 110ft" (there's even a height box!), but then you can't really sort routes by "north facing vs south facing", "cave vs slab", or "over/under 100ft". Instead of manually adding a route info form for every piece of data someone wants to sort a route by, MP could allow users to add user-defined data tags and values, then search by them. Or, simpler, more list support.
As it stands now, if you want to find the right climbs for the weather in a new-to-you area, you have to read a lot of route descriptions.