Two features to /t online:
1. Make town staff be a different color in /t online or give them a label, saying Assistant or Co-Mayor or whatever.
2. /t online - would show the players online in . It would cut down on "Anyone online in _______?" spam in shout. Just like the /t command, /t online with no town would specify your town. This would also mix well with the /ta and /tb suggestions.