Hello!!!
1.
Cookie's explanation about removing the Cell Phone / Credit Card Warning
About the others, I'll try to find out
Edit:
2. Some plugins I remember: StuffPlug and Messenger Discovery... If you Google, i think you'll find some more... Take a look on [Download] > Messenger Plus! stuff
3. In some place on the Plus! site, it had the registry tweaks.. But I remember that someone made the Plus! Tweak -> program to easy change Registry Settings -> You can find a link on mess.be site (given by Supersonicdarky) on Messenger Plus! stuff too
/ 
