I know there's currently 1 wilderness location when completing clues, I'd like too see more of these and possibly in deeper wilderness.
I'm not so sure about actually making the clues more rewarding, but definitely would like to see more wilderness steps included in all types of clue scrolls.
Support! :)
EDIT: I also think we should introduce steps in wilderness which involve killing an NPC so players can't enter with a spade and complete the clue scroll.
Perhaps having community live streams, similar to Oldschool Runescape, in which the administrative team talk with players about up-coming updates and discuss new ideas. Whether the team would go this far is a different story though.
Relative to your post though, I think they should introduce an in-game polling system in which players can vote for specific content and prioritise new content over others. Perhaps a scale relative to how urgent or how quickly the specific player would like to see the content in-game.