I know there's a mod for it, but would it be possible to integrate a ban reason so when you ban a member you can specify a message/reason to show them if they try to visit?

That'd be gr8 :)

Ty :)
~Shadow

This is a really great idea!

I agree; I think there should be the ability to display the most recent warn log entry [or whichever was associated with the suspension, if there is one] on the suspension error page.