Passing arguments to add form inside a panel

Hello

I am trying to avoid using "current user" and other contextual information that are plagued with subtles bugs and limitation.

So I wanted to pass explicite arguments to my add form inside a panel.

Is it possible to do that ?

That argument could be used to set a value in the form or whatever and I can to that in code, but first I need to be able to pass the argument to the add form and I can't find how to do that neither at the "add form" context creation nor when adding the form element to a "panel part" in a layout ...

Is there a way ? Am I missing something ?

thanks a lot for any help or tips, I looked around but did not see something relevant, yet :)