[galaxy-dev] Tool development: Is it possible to pass a user's id in dynamic_options() parameter?

This was asked a few years ago but no takers: Galaxy Tool Development: (http://dev.list.galaxyproject.org/Reading-user-id-before-the-execution-of-th...) Seems like this isn't possible, unless there's a way to plant user's name in a text field on the tool's form, so that a dynamic_options() call can refer to it? Thx for insights, Damion