You are using a very niche server of tron to make the case for everyone having to log in.
The only other case I can think of where it could be an issue is your ladder score, which is pointless anyways.
The day I have to log in to play tron is the day I quit playing tron, and I doubt im the only one. If you want to force, or even condone, logging in you might as well start selling microtransactions. Dont forgot to let them only play so many games a day unless they buy "Gridcoins"