Similar to peaks in a day, how about a list of prominence in a day, with a threshold perhaps of 10k+ feet instead of 5+ peaks. Tangents could be number of 1k+, 2k+, and/or 5k+ prominence peaks in a day as well. Variations could also be done using isolation as well as elevation cutoffs. Just food for thought, I had alot of time for my mind to wander last weekend with 2 different 8 hour solo outings :)
Al