Cool, I can confirm that Shift+Alt works in Live Mode
2 more "bugs" I think:
1. When in DM-Mode and you save a snapshot, then unselect any track or click into the empty TCP-area (effectively unselecting all tracks) Stripper crashes with the following message: "Stripper.lua:41902: table index is nil".
After that all DM-Strips are again Dummy-Strips and you have to re-connect all of them again.
2. and if drag in a normal non-DM-Strip from the Strip-popup browser in DM-mode and want to save a snapshot it says "No Slot to write data" (or something in that manner) and does not Save any snapshot.
(3) snapshots saved with DM-Strip in DM-mode are also there in the same strips in normal Live-Mode too.
Really sorry for bothering you. But seems like there are some quirks happening with snapshots. I am totally happy with Live-mode as always, but as DM-mode is so great, it would be cool to use it to it's full potential