MultiAVCHD does have support for a pop-up menus, though you have no control or preview (from what I've seen) on how it looks.
For mine, I intended on creating the shell within DVD Architect using placeholders and replacing them with the real sources using BDFix.
Also because I wanted to add in the trailers/tv spots from the 2004 Bonus DVD and the Deleted/Extended scenes & Featurettes from the Complete Saga BD set.