using version 7.1.1, installation has a few issues, installed the viewer but after install crossover claimed it wasn't installed and ffxi wouldn't install, rather than creating a new bottle I just simply installed viewer a second time into same bottle, worked perfect, all expansions installed, play online viewer sound works fine after enabling driver emulation. in order to get graphics to work I had to set graphics to emulate monitor at 1024x768, turn off hardware vertex shader support, put playonline viewer into full screen mode.
play online viewer functions perfectly with the exception of sometimes the graphics flip upside down, this can sometimes be temporarily fixed by moving mouse in and out of the window, if that fails sometimes clicking stuff, like the logout button, will fix it, imediately cancel the logout rather than logging out, but the act of poping up the logout prompt seems to correct the graphics.
game play is unknown, i'm on satellite internet which is metered, so I can't spare the bandwidth to update the game, will update it somewhere else when I get time and give results of that. so far, only issue that appears in need of fixing is the screen inverting at random.
I hope this helps with bringing ffxi support to crossover
edit, I forgot to mention that sometimes when installing it appears crossover or the installer is frozen, this is especially true when installing the viewer and ffxi, not the expansions. the progress bar jumps to 100% after a few seconds and the installer doesn't go away, leaving you to believe it's froze, it's not. it's still installing, the progress bar in the installer of some versions of the cd tends to clash with crossover a bit. ignore it, let it go, it'll finish in time.