Right, currently it simply opens ML menu. Sometimes I use the camera with one hand, so it's nice to be able to navigate ML menu without reaching to the other side for the Delete button.
There are a couple of shortcuts that go to specific menu entries. For example, ISO + Q opens the Expo menu, and AF mode + Q opens the Focus menu. I've even forgotten the shortcut for these and had to look them up in the source, so it's probably time for some cleanup.
Some more ideas about shortcut keys: https://www.magiclantern.fm/forum/index.php?topic=7816
For lens parameters, the DOF button would have been nice; unfortunately it's not triggered at all with a manual lens.
Misc notes, possibly unrelated:
- On 5D2, WB + SET triggers ML's auto white balance. I remember some people found this less than handy, as they were expecting to start recording instead.
- I liked a tweak from a script in the lua_touch branch: opening ML menu by dragging the finger from top to bottom, and was thinking to enable it by default.
years agou i've added some shortcut to ML menus for 600D and got used to them, I've now updated those changes to unified
here in those days.
I've not made any PR because I was thinking to be the only one needing it, but if. there is need we can define together what shortcut to use
for now they are triggered by trash button when in some gui mode:
FOCUS + trash = TrapFocus
WB + trash = WB
ISO + trash = ISO
PICSTYLE + trash = GlobalDraw
Q_ACTIVE + trash = Beep, test tone
I'm also used to the junkie menu and find useful to remove all menu that are set and forget and keep only stuff that has to be switched on and off here, only for photo.
I have like 3 or 4 column only with max 9 options shown.
It's really easy to use like this and fast to change setting.
One nice improvement imho will be an option to remove the info bar under it when in junkie mode since it's an advanced feature an (at least as I use it) should provide a more clean approach for user that are not first time user, not?
Without the bottom bar with the help strings it will have more space to render the buttons bigger and be more clean.
NOTE on the picture attached: since i've finally manged to port my old old old PR for c-modes and gui options to a module i can now change fast K and othr basic photo setting without ML menu so the first four blue button are not needed anymore making more simple and faster junkie mode ever for me

Another great feat i think could be if junkie mode differentiate from photo mode and video mode (sort of like canon does), so to being able to have different buttons enabled for the two mode.
In my junkie menu I have 15 button displayed for photo only, in movie mode are all useless apart from focus settings, so having junkie mode switch to aother set of configuration in movie mode will let me use it also there instead of standard ML menu.