Adding mouse-over text and information buttons to form fields

Hi folks,

One of many use cases is that I have a 5-character limited text field that I want the user to put in a username. The field is called "User Name." (We don't use domain name as our users rarely know what that is.)

Mouse-over text: Presently, when I mouse over this custom field, the mouse-over text simply displays the field name. Can the mouse-over text be customized or show the description rather than the field name?

Informational Button: It would be great to have an informational button (just like the kind used in SDP to let us know about information) that we can add to our own fields.

Thanks for considering this,
Adam