I'd love to get feedback on these things as I feel they would be a nice addition to the game. Feel free to drop your suggestions below as well.
1. Item overlays
This would show items that are worth a certain amount as a text over the item loot. For example, If you were to kill someone with dragon claws during a team fight, instead of you right clicking and paying attention to what you got from the guy, you could see it instantly. The highest priced item would also be prioritized and put on top of the loot pile. You will be able to fully customize this feature such as changing the amount(pkp) minimum worth amount and changing the text color.
2. Call familiar/bob
Just as OSRS, you'd be able to call your pet to you if you are unable to find it by clicking the icon in your Equipment tab.
3. Prayer book customization
When I used to work as the client developer on this server, a few people have asked me to make a toggle that changes the prayer icons. Similar to F-keys, you would be able to set your prayer icons to which ever slot you'd like.
NO IMAGE AS OF YET
4. Revision changing
This would allow you to change to different revisions based on your preference. 377, Osrs and 562 would be the two revisions you can swap from. This will not add new items into the game but it will change the look of Animations, Graphics and player models.
5. Sound system
As we all know, roat does not have any sound. I know that some users may not care but I believe that combat sounds are very beneficial to a pk server.