First Of I reckon that there should be a npc that will reset any stat so if you got 70 fishing and you want it at 1 go to the npc talk to him and select the fishing icon to reset :O
Also the special attacks when your attacking npc it usaully doesn't hit and uses up double the special power
at pking the farcasting should be set to a number of spaces away from the person getting farcasted. eg. if i was getting barraged and the person doing it was on the very edge of seeing me it should make him run atleast 10 spaces away from me for the spell to actaully work. this is good because you can actaully see who is attacking you and you have more of a chance to get help or to attack him
ok 4th idea fairly simple if this applies maby 1st idea shoudlnt apply but! here it is
In the game were it shows you price checker and stats for you items it should have another button next to it that locks your exp so.... if your a pure with 70 attk u dont want 99 and ur using whip you click lock exp and u can use whip with out gaining levels =] and after your pk or npc killing you click the bottom again and you can resume getting exp for thouse skills :O
those are my ideas thank you