Has anyone done this?

I rarely get asked for a refund on my software products. With certain
people I know I'm being scammed.

I do not use subscriptions. I use Secwin to license the product.
I know I could send them a new activation code that basically disables
the product but I can't guarantee they would use it.

I have been using the standard uninstall.

What I'd like to do is:

1. Have the user uninstall and either send me a message
2. Delete files that were NOT installed by the installer (like the setup).
3. Add a registry entry to indicate the product was unlicensed

Anyone done something like this?

Thanks,
Paul