On survival, Skytitan gets a second hime as a perk. There is really few extra perks that Skytitan get so I think they should be the only ones to get it.
maybe adding it to high roller then, that and colored nick would be nice which i made another suggestion abt ; maybe both for high roller on eco?
How about, instead of a new command for home, is, etc, What about signs with clickable commands. Such as a sign that says /visit profitshop or /visit farm, etc. And type coords for the tp to recognise. A sign at your spawn saying /visit profitshop on first line, and second line having the coords, there could be a plugin that let's players click the coords and get a tp sent there. Idk how practical it would be to set that up, but it's a different idea to having new island spawn commands that would be difficult to imply.