Although such low-level control would be great to have i highly doubt its less hassle then route certain message loop events and commands from the script engine to winapi and other way around.
I think that what he's saying is that it would be less work to add low level support than to constantly add new controls and features.
Obviously one or two features/controls might be easy enough to add but where does it stop? DCX has been going on for years now.. Khaled can't really dedicate that much time to building up dialogs and neglect everything else.
That being said, I would still rather see high level support than low level, even if it's just one new control/feature/event per version!
dialog t {
title ""
size -1 -1 300 300
treeview 1, 0 0 300 300, lines buttons
}
Beautiful <3