SlvrFx:The number one feature for me would be to download ALL the locations for a given category.
I travel often and try to keep my gps loaded with current category locations but I dont have the time to look up waymarks in new locations before trips. Therefore, I just want to download ALL points for the entire category. An easy way may be to allow premium members to select up to 3000 miles from current zip-code (that should get me most of North America). The current 200 miles is too restrictive.
Second feature would be ability to be notified of changes/additions to my favorite categories.
Third feature would be Pocket Queries like Geocaching.com
There is no mileage restriction on the categories. Go to the category page and they are organized from newest to oldest. So if you are interested in the a particular category you can start at the oldest and get those and as new ones are added just download those. Might be tough to do the first time through but after that it is just downloading the newest. Really don't have to worry too much about archived Waymarks very often.
You can already get the new waymarks to your favorite categories, just subscribe to the rss feed for the category. On the category page is on the bottom right with a rss icon and Newest...