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The current API only allows to inform the user when the target chooser panel is going away. It is a solution, but some actions which are already done are irreversible, like creation of nonexistent folders. (from issue 15267, parts 1st, 2nd) Postpone creating irreversible object (e.g. harddrive, remote server) at the time when user gone over wizard (i.e. Finish option).
I decrease the priority. There was only one known use-case (creating new folders in TemplateWizard) where this task made a sense. Because TemplateWizard has been broadly changed and an user has no use for creating new folders, then this task is no urgent, needn't be fixed.
To be consistent with the last comment, I close as wontfix.
This issue was solved long time ago. Because nobody has reopened it neither added comments, we are verifying/closing it now. If you are still able to reproduce the problem, please reopen. Thanks in advance.