Did you know that there are 124 keyboard shortcuts in memoQ 2015?
And those are just the preassigned defaults. You can create shortcuts for dozens more functions, and edit existing hotkeys, under Options > Keyboard shortcuts.
Here is the full list. Even if you learn only a handful, you could still save yourself a whole lot of time and mousework.
Note: The keyboard shortcuts posted in this blog post are applicable to memoQ 2015. Shortcuts in memoQ are generally standard, but may vary from version to version.