Not a bad idea at all imo. The only way I multi SnG's is staggering starting time. I know many people can play them all at once, but I like to give myself a good read on everybody and hit one good pot before I start a second. Typically I'm going like 30 mins or so into the game before I feel comfortable firing up the next. The other advantage is when you get down to 3 players or heads-up you've go to be much more active, I find I have a decent shot of that if my second table still has lower blinds and 6 players. I don't see how some people do solid heads-up play with a bunch of tables, beyond me.
Also, I've found cash tables, especially full rings are WAY easier to multi, because itttt'''ssss sooo sloooooowwwwwwwwww.

Another idea is to have your regular cash game open and then open up a play money table or two to practice. Keep a firm grip on the cash one as a priority. If crap starts to hit the fan u can sit out or quit the other tables with peace of mind knowing it's play money.