[TYPO3-mvc] Extending FrontendUser in two or more extensions?

[Frederik Mogensen]

Hey All..

Im just getting into developing my first extbase/fluid extensions..

But have run into a problem.

I need to extend the frontend user, to add some properties to the users, and
does this by extending Tx_Extbase_Domain_Model_FrontendUser.

This sets the "tx_extbase_type" field in the fe_users table to
"Tx_Planner_Domain_Model_Admin".

Now my question is, does this mean that I can not extend that user in other
extensions to add other properties needed in them?

Greetings
/Frederik Mogensen