Before I begin, I appreciate you acknowledging that these are unpopular suggestions.
1 - Don't PvP much, especially range/bridding, so not going to comment.
2 - The way the game works now, with different bosses dropping different items to what they necessarily would on OSRS is much needed, we don't have multiple worlds, so content has to be spread out, otherwise clans and such would monopolize the bosses which dropped the big-ticket items.
3 - Just no, we've just seen a huge update introduced, such a huge change would cause more than 50% of the servers population to quit.
4 - Can you clarify what you mean? Is this pertaining to the regeneration you get upon a kill or restoring your special at the ornate pool?
5 - I feel as though the way it works now is to ensure players can instantly get back to PKing after a death, especially in Edge. I would agree, but only if we could introduce a mechanic that automatically took the Gp to repair the items from your bank if you were to die, therefore automatically repairing the item.
6 - Stakes, yes possibly. As for the Trading post, no, I just don't think it's necessary, and would just cause prices to increase even more.
7 - This is pretty much what we already have, the only thing is that caskets offer players who aren't feeling lucky to instantly be able to cash out on that casket. If they do get lucky when opening the casket, they will get one of the aforementioned items. I prefer the way it works as of now.
8 - I agree some skills, such as thieving could do with an experience rate increase, the majority are fine, and changing experience rates now just serves to downgrade the achievements of players who have already gained max levels in skills, so can't agree here.
9 - Sure, but only very slightly or in specific scenarios.
10 - Sure, although it isn't too hard to create your own, I feel like this would lead to more Zerker PKing.
11- This is RuneScape, so risk vs reward is a big factor. The wilderness should offer the best money making methods, and there are already several decent money making methods outside of the wilderness.