Hey there radiok,
I guess for me the Maintenance Mode thing isn't too much of an issue, as I can just disable the plugin fully when not using it (a little inconvenient, but by no means grievous).
A couple of other small issues:
Here is a sample custom email I created for the register process, which I received into my own inbox after doing a dummy test registration.
Hi, and thanks for registering to become a contributor at PixelProfits.net!
Here\\\'s your login details:
You are able to login to your profile and begin posting immediately.
(etc etc, some other stuff here...)
I notice the user password placeholder didn't seem to work. I did this a couple of times and haven't got it working. Note that I used minimum length (7 character) passwords for these tests. Any thoughts?
Also the weird escape characters that just appeared before the apostrophe in "Here's". These seem to appear every time I update the settings. I can get rid of the apostrophe, but thought you might like to know.