I'm no programmer, but you could use the mac addy of the hard drive, nic card etc.........wont stop those determined to cause trouble, but would be a pain in the backside having to swap components out for the ability to.
Hopefully H2H will come back up, I dont fly there, but some of the ppl who fly there and in the MA are good fella's. (Cant speak for the rest of them, dont know them..lol)
Wurzel