A product enhancement to be able to remove "Password never expires option from WI" has been logged: TF00494437
It is not possible to modify 'custom entry' out of the box because the content of the screen is generated by ActiveRoles code and there is no way to remove part of the entry without modifying the code.
ActiveRoles does support creation of your own custom entries. It is recommended that the person doing this have VBS programming skills as well as HTML knowledge. The process for this and a small sample are described in the ActiveRoles SDK. For developing custom entries it is suggested to request Professional Services to assist.