Password reset from SU10/SU12 is possible now. This was added with the SAP Note 1469961 (SU01/SU10: Revision to password dialog box).
It uses the same BAPI (BAPI_USER_CHANGE) to reset the password for the mass users and is available in the log file.
However, the dialog box is not so user friendly and doesn’t navigate through the steps correctly.
Further, this note also fixes few other issues related to SU10.