You currently have
<shortcut>| to split a key between
its left & right neighbors.
(BTW, you should spell out that
that's a vertical bar (fence) char and not an uppercase "i" or
lowercase "L" (in sans serif fonts all three chars are very
similar).
How about one to split in the other direction with
neighbors above & below? Perhaps:
<shortcut>-
(i.e., hyphen)
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Implemented in CVS.