Here's a few pk-related suggestions:
-Add a scoreboard which displays top 10 pkers (with kills/deaths/kdr listed)
-Add commands (or ability to click option in quest tab) so that you can show your kills/deaths/kdr
-Remove skeletons/wizards north of edge wild
EDIT:
-Make it so you can't vengeance after the timer passes for the first vengeance.
-Make it so when you switch from whip+shield to a 2-handed weapon, the whip goes in the inventory first, before the shield. This isn't much of a problem but it's how it should be. The way it is right now is if you wear a 2-handed weapon, the shield goes in inventory before whip.
-Make it so you have to pay to get into the wilderness resource area, like in OSRS.
-Ballista speed got updated in osrs, so maybe increase the speed of damage of ballista?
EDIT2:
-Add bolt rack in range shop? just makes using karils bow easier