Yeah, I havent actually done that myself yet, but I have 'one' piece of info on that. Blue said he copied his one wallet.dat file over to 10 machines, and now on his desktop he receives notifications when any machine mines a block (IE the txlist updates). So he has one consolidated wallet.
I was going to add: In POW, since coins can be received in a locked wallet, you can encrypt and lock your wallet and still receive rewards from any POW device out there mining into that single wallet.
Definitely, wallets should always be encrypted, especially if you're going to be distributing it across multiple machines. You should also keep an encrypted backup copy in cloud storage or at least a USB or something. I'm sure there's even tools that would let you make a paper BBP wallet. As long as it's encrypted nobody can do anything with the wallet file even if it's stolen or compromised, and it protects you from losing your wallet to a HDD failure or laptop theft or anything else that can happen if you only have a single copy.