not really a feature "request" - but there is a new attribute "wireless beacon" for caches that use Garmin chirp (and *of course* similar systems lol)...
http://www.geocaching.com/about/icons.aspx.
If you are implementing this, make sure you check
- the filter presets
. the filter dialog (parameter 5 of CollapseListItem)
BTW: Since there are sooo many attributes, it could make sense to group them into several CollapseListItems. The headlines in the cited webpage could be a suggestion, although "Camping Available" is IMHO more a "Facilities" attribute and climbing, wading, swimming, Night Cache, Park and Grab and Abandoned Structure (maybe Stealth Required) might qualify for an own category ("Challenges?").