Thanks for the feedback Lefty.
I did see a fair few articles, some using machine code JMP command, some hard-wiring pulses to things but this being bad.. I was just wondering of an opto would work because of the complete circuit isolation.
I think I have an answer to the reset conundrum that'll beat the software gurus though 
I have implemented a serial protocol for setting and getting variables that control my application, also some command will interact with the bluetooth modem but require a restart to take effect. If you can justify having a reset button (instead of just removing power and re-applying it) then it would be nice to be able to call it remotely over the serial link
Cheers
N.