Tomasz,
I'm not sure about adding fields in UME that don't already exist there. However any field that is set in sourcing directory configuration as PULL will get updated on subsequent logins. In regards to the Deactivate and in general you could always generate delta changes in AD as a CSV file and import that into UME and Sourcing as a background process. This obviously is not the most convenient method but could be used as a last resort if any of the automatic options are not suitable.
Regards,
Gary