I have found this to work in the Register programs for Avara, Escape Velocity, and Snapz Pro.
1) Open up the Register program
2) Open up CODE 2 ("Panes")
3) You need to look for the hex "504F66". If you have the CODE editor if you use ResEdit, you should see an "ADDQ.W #$8,sp" and "BNE.S". The hex for the bne.s is 66, change this to 60.
4) Save, quit
5) Lauch the register program. Click Enter License Code. Enter any name, any # of copies, any reg code.
6) Viola.
Notes about the addq/bne: they should be above a function called "_ValidRect". In the Register Snapz Pro and Register Avara apps, I found them at offset "0D18". In the Register Escape Velocity app, I found a bit after that in a function called "EnterCodePaneHit"