Why would you use more than one wallet? You can do PoG from multiple wallets, but there's no point. You can just shorten the time you tithe from every 4 hours to as quickly as every 2 minutes. Unless you've got such a huge bankroll where 2 minutes wouldn't exhaust your coin age, then you'd need to spread out to multiple wallets. Until then, it is more maintenance of multiple wallets without a good reason.
The only reason I had for multiple wallets was just because I didn't like the idea of having all my BBP in one wallet. Especially since my original wallet which is associated with BOINC is very old and crashes every now and then. I let it build up then transfer some to the other 2 wallets. I guess I can retire that wallet and laptop and move everything to my newer laptop and re-associate that wallet to my BOINC account or should I just stop doing BOINC since POG is much greener?