so really this should take the form of a way to add separate sets of POIs with
name, coordinates, text description, link
to Waze, and then to allow me to select one or more of those sets and assign a radius to each, to alert me if I get that near to one of those POIs. Once it does alert me, i should be able to click and share that POI with a selectable app to get the detailed info.

POI lists should be easily updated (and have the ability to mark single POIs as 'done/no longer interesting')

I really would like this. All it really needs is a way to accept POIs (and an event radius when to alert me that I am near/approaching a POI) and a way to show a link that opens up the cache in some other app (Locus, geocaching on Android). Ie, i don't card about many cache details in Waze, just for it to let me know where caches and if i am approaching one (variable event radius)...
The idea is to have waze alert me when driving that I have caches i might want to do

I'd like the geocache search and navigate feature a lot. Just like foursquare, just enter text (which could be a GCXXX code), click search, switch to geocache icon, pick the cache, and click navigate to that coordinate. A 2nd advanced feature would be to be aware of multiple locations on the cache (those with the coordinate for the parking space for example) and show all those locations, but i'd be happy with the simpler version first.

Great Idea. Fun for the whole family.