Already thinking about D8-suggestions? LOL

One of the features I miss is the ability to easily create and manage dependent fields. Thankfully, there is AntonLV's "Self-manageable DF" which he will hopefully upgrade soon.

Example: You create custom field, "Favorite Color". User selects choice from a drop-down list, or, if his "color" is not on said drop-down list, user inputs his own, which is also automatically added to the list (and which in turn is nicely reordered see more alphabetically).

Then, there is the "people you might know/might want to know" and "friend's activity" features (also offered as mods for D6) with the enhancement that admins could further tie to their dependent fields (i.e., suggest friends not only by degree of relationship--friends of friends--but also by "Favorite Color"-type of profile dependent fields.