pabloca: I think I got it now. You want to be able to sort the list of games in the main page by the online status of the opponent, is that it?
If you want it to find games with online opponents, there's options for it when you submit a move. You can also go through Settings and define the way to find the next game to play.
If you just made that request for the visual effect of the thing it's not possible (at least for now). Which is probably why you're requesting it :P

The Spanish forum may seem empty, but it doesn't mean you won't get an answer. Some Spanish speaking players have that as a favourite forum, so when someone posts something in there, they'll fly right through to answer whatever questions were asked (if they're online, of course).

I really hope you understood me. If not, we can move this to the Spanish forum and I'll try to do my best to speak in your language