Excuse me if i am wrong but it seems to me extremely unwise to opt out of NMC mining since even if you do, your hash rate is still used to generate NMC so you basically giving your NMC away. It is not that hard to run a namecoind (in a virtual machine if you don't trust the namecoind builds) once to create a wallet to receive the NMC.

You can just put the nmc wallet near your bitcoin wallet backup and forget about it, and one day you can exchange a large bunch of namecoins for bitcoins for some extra income.