Yes this is something I have thought about and worried about before. I play reasonably (and sometimes too) tight in these and I hate watching someone chip accumulate with massive preflop calls and raises with some complete garbage.
The trick is, however you play it must be adjusted to the table play at the time and the stage of the tourney. I've seen people build up big stacks on the " ooooo one of my cards is higher than a 7 I'd better go all in!" principal and then chuck it away after the rebuy period because they cant change or adapt their game.
I'm not sure if there is an answer (or at least I aint found it yet). One thing I would warn against is radically altering your game away from how you normally play....sounds a recipie for disaster that one.
One adaptation I have made to my game online at least that has helped isnt actually anything to do with playing but more to do with bankroll management. That is to stop rebuying in larger tourneys close to the end of the rebuy period. If the average chip stack is upto 3or 4 times the amount you can rebuy for (as it can often be on say Stars for instance), I think it 's better not to rebuy but save your money for the buy in to the next one. Otherwise your rebuying into a tourney where your already massively behind.
I dont always follow this principal when playing live (even though I ought to) simply for the reason that I'm playing for fun as well as profit (I wish!). But on line its different...you finish one tourney and the next one is there in a few minutes usually if you want.