I spent a few moments testing a suspended account today.

When attempting to log on via the customer CP, pressing 'Login', after entering the correct username and password, simply cleared the fields and returned me to the login screen.

Low priority, I know, and it may be "working as designed", however I offer this...

I think it would be more desirable/user friendly to offer some verbiage to the customer regarding why they cannot log in. Doesn't have to be 'account suspended', but maybe something like "please contact <vendor variable> support at <vendor contact variable>".