Some nice ideas in here Silver:
1 - This could be implemented but I don't think it's very essential because the majority of players use gear presets, resulting in them not having to bank.
2 - I believe Claws aren't as accurate as AGS some of the time. Although, I have been specced an 83 with claws whilst wearing an Ely - so its definitely capable of hitting some high numbers when it does.
3 - There is a lot of content already in the wilderness, having Vorkath instead of Skotizo for example. There is also the Wyvern cave located in level 53 wilderness, along with all the other 07 bosses other than Crazy Archaeologist.
4 - There is an Imbue Scroll in the current Pkp shop, you'll just need to buy a ring from the armour shop and combine the two.
5 - Bgs and Zgs were already in the shop at one point, and they were then removed. I personally don't see anything wrong with adding Zgs/Bgs back into the Weapon shop, but that's based on me not knowing the reason why they were removed in the first place. I don't think Ags should be in there though, I class it as a item that requires effort in order to use, being one of the best spec weapons.
6 - We currently have Max Capes once you get 99 in all trainable skills (Agility, Herblore, Crafting, Slayer, Fishing, Cooking, Firemaking + Woodcutting).