As it has been stated above. If you want to slay a boss you can in most cases buy an instance (this doesn't work for Wildy bosses - Go kill them) NO SUPPORT - if it isn't broken don't fix break it.
I don't think we have a community big enough for a DMM mode, unless it's a weekend event. Friday-Sunday as we see in the original OSRS it dies out within a week and that's with a player base that's massive compare to Alora. NO SUPPORT
For the XP lamps - why? I mean how would we scale it, to be worth it and not too OP? I think it's better to just leave it out as it would either be too OP or not worth the grind. NO SUPPORT
Castle Wars - Hell yes! Bring in the Castle Wars mini-game. But do it as Weekend event ONLY and let the winner(s) carry the title through the upcoming week - As you might have realized what brings people to the grind is the recognition through status such as FrontPage, Pets, Ranks etc. SUPPORT