Adding another back/next button

I know it is possible using ResourceHacker, but would it be possible to tell from the NSIS script that the user has clicked this extra button.

Currently, I have Settings, Go! >, and Close buttons, but now I need a Back button due to another dialog executed onInit.

I would like it so when the user clicks my new button (will be Back) then it simply execute a piece of code (which will re-launch installer and quit itself to go Back).

Possible?

-Stu ?

Not without a plug-in.

🙄 😁

-Stu 😛