The idea behind the Loyalty system was giving players the ability to unlock cosmetic items simply for the time spent in-game. Since this is somewhat abusable (it isn't too difficult to obtain loyalty points while you sleep), adding items with actual value (Crystal keys, for example) would surely lead to abuse of this system. I'm not against adding new items, and with proper suggestions we could revamp the shop a bit with some cosmetics/untradables, but I'm not too keen on adding items that are tradable and worth something for that reason.
Hadn't thought about it but Mr.Omicron is right this system is abusable, so back to my original idea:
Well I was thinking of requesting Naval items/tri-corn hats moved from Mystery boxes into a shop seeing as they are un-tradable, could also add miscellaneous cosmetics obtained via quests from osrs, such as the builders outfit from the Tower of Life quest. How ever I do vote we keep the current items obtainable in some way, shape, or form, so as not to create unnecessary rares in the economy as people lose their sandals or what not. Whether it's simply expanding the Loyalty shop to include these new items, or removing items obtainable via other means, such as items dropped by npc's or should be dropped by npc's.