How to extend the user model?

[lista]

I'd like someone who already dealt with this to give me an advice.
How would you extend the user model, or to put it in another words, how would you add your own custom properties to the user?
Obviously, the original contentModel.xml should not be modified.

All advices are welcome.

Cheers,
Lista.

[inocka]

Did you mean that I should use directly r.disabled in jsp or I should create specific user property for that?
Thanks

you can create to  have rendered="!r.disabled"

[savic_prvoslav]

if user has disabled propertie then why no to use it .
if prp is custom then you have #{r['acme:document_id']};

[inocka]

Thanks for quick reply savic.prvoslav. Am I write that there is not such default r.disabled property for alfresco standard user cmerson?

[savic_prvoslav]

you must create your own, sorry. but that is so easy, you override UsersDialog . and add property resolover and add that r.disable and based onthat you render it or not.