[LittleD]

Lässt sich doch über die TypoScript Constants der Extension (sr_fe_user_register) lösen oder nicht?
Also einfach im Bereich TS template constants (nicht setup!) folgendes eintragen:

Typoscript-Code:

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plugin.tx_srfeuserregister_pi1.allowUserGroupSelection = 1 plugin.tx_srfeuserregister_pi1.allowUserGroupUpdate = 1 plugin.tx_srfeuserregister_pi1.allowMultipleUserGroupSelection = 1

allowUserGroupSelection

Allow selection of usergroup on registration. If set, the user may select to adhere to user group(s) when registering.
Note: The selectable usergroups must be located in the page identified by the pid constant.
Note: If constants userGroupUponRegistration and userGroupAfterConfirmation are set, the usergroups they specify are not selectable.
Note: Field usergroup must be included in the list specified by constant formFields.

allowUserGroupUpdate

Allow selection of usergroup on editing. If set, the user may edit the list of user groups to which he(she) belongs.
Note: See also constant allowUserGroupSelection.

allowMultipleUserGroupSelection

Allow selection of multiple usergroups. If set, the user may select to adhere to multiple user groups.
Note: See also constants allowUserGroupSelection and allowUserGroupUpdate.