There is currently no desideratum for a second world. To commence with, it would split up the community, which I would very much dislike. There is an astronomically immense variety of locations which all contains near enough the same monsters, and there are also boss instances in the game. I would only support a second world (with requisites), if there were constantly over a thousand players online at once, but that's a highly unlikely thing to witness on a RuneScape Private Server in 2019, regardless of how great a RuneScape Private Server's game play and community are.
I would, however, absolutely love to optically discern Deadman Mode. With it being promoted and having astronomically immense rewards up for prehends, I feel it would magnetize many PKers to Alora, thus causing Alora's community to largely grow. The only downfall would be a plethora of toxicity and such, because unfortunately that's what you get with a big PK community and PK rivalry.
I'd love Alora to have Castle Wars in-game. It was at one point my all time favourite mini-game in RuneScape, it would certainly take me back and give me nostalgia feels.