Custom Export - Disable standards

To add my custom filetype I can use

Protected Overrides Function AddFileTypes(options As Rhino.FileIO.FileWriteOptions) As Rhino.PlugIns.FileTypeList
    Dim result = New Rhino.PlugIns.FileTypeList()
    result.AddFileType("LutraCAD (*.lcad)", "lcad")
    Return result
End Function

Is it possible to disable all other options like STL etc?

Or is is possible to show a custom dialog when Save As is used or export?

Sorry, no.

You could always write your own “Export” command. But you can’t modify how Rhino’s Export command works.

– Dale