If you give the choice to chose a rollover it has to be a one time choice. If there is always a possibility of changing your rollover then there will be someone who will need to do so to optimize. If you are cool with “changing your rollover” as a vector of strategy then that is one thing, but otherwise it must be one time choice (which is forced the first time you play) or random.

Also, as a KOLer (as was said before, sorry) I know they do a bunch of backup and such at rollover. I don’t know what your technical side looks like for this, but are you sure you wont need at least some time to bring the game down for this kind of thing in the future. Maybe something to think about before committing to something. I admittedly know nothing about how these games work on the back end, but I figure it might be a consideration.

All that said I really like the idea of random rollover as a lag fighting tool, and from what I’ve seen my guess would be that you wouldn’t hurt balance in the competition after the first week.

-EI