Ecco has these two useful shortcuts:
Move to previous item at level to left    CTRL + PAGE UP
Move to next item at level to left    CTRL + PAGE DOWN

They provide an easy way to move from a subitem to its parent or the next higher level item down the grid. Is there an equivalent in IQ? A workaround for the first one seems to be Up, Ctrl-Left, Ctrl-Right, for the second Ctrl-Left, Ctrl-Right, Shift-Alt-Down, but they're not particularly handy.
 

Thanks!