The only cheat code I've ever been inclined to generate is one that permanently enabled the extra charaters in Sailor Moon Kurukkurin 'cos I was always forgetting the button sequence for the cheat. Other than that, codes don't really play a part in my gaming habits.
And I really don't have a problem with generating codes on the PC then just punching them into XSNES9X. I guess it's like the Samba/Relax issue, how important you consider it is down to how much you'll use it. Which for me at least is not at all.

So I guess now I'll have to find something else to bug lantus about
