My friend and I have been playing for a about a week now, and today by accident I discovered that CTRL-Double Left Click within the inventory does a select all function in containers/nanopacks. I couldn't find this in any ingame tooltips, we've actually been annoyed thinking this didn't exist and have been manually selecting via CTRL+Left Click 1 by 1 to drag multiple items around.
This is mostly a "Newbie Help" item, to add it to the context menu where I see there is room left for more tool-tips. Please see screen capture for my suggestion to add this tool-tip.
-Neoki