Here are some of my suggestions they may not be the best and some may be stuff that just needs to be fixed
1. Add lava strykewyrms ingame ( you are able to obtain as a slayer task but i could not find any ingame) also they would drop the wyrm heart, wyrm spike and the wyrm scalp for those who don't know what these items are the wyrm heart is combined with a staff of light to get the staff of darkness, the wyrm spike is combined with a abyssal whip to get the lava whip and the wyrm scalp is combined with the dark bow to get the strykebow.
2. Some of the dungeoneering rewards do not work ( im sure some of you already know this)
* The skilling scrolls from the shop do not work
Im sure there are other rewards that do not work but these are the ones i have found that do not work
3. Ferocious rings (idk if they are already ingame i asked around got no answer)
4. Possibly fix court summons and make them give a chance for maybe a cosmetic item or skilling supplies (doesn't have to be those as rewards just an idea
5. Fix GWD soulstones ( would kinda be nice)
6. Add some new teleports to Ariane ( some more skilling teleports and training teleports)
7. Change the "reventants" teleport in bossing teleports to "revenants"
8. Crystal weapons ( have not seen any ingame)
These are my only suggestions for now im sorry if they are lame.