Add another alias for --tag: Shorthand '-#'

[ewen-lbh]

The idea is that, currently, the only sane ways to add tags/labels are -tlabel1 or -llabel2.
This looks a bit ugly to me, I'd prefer using a non-alphanumeric character, much more rarely-seen in label names, so that reading command history is nicer. Hence, any easily-typable character will do.
I have several candidates, with a preference for ":", which would look like ideaseed my-repo -iT'My title' 'my idea' -:label1 -:label2:

• :
• ! (though it might cause problems with certain shells)
• /
• + (not easily typable, at least on french AZERTY keyboards)
• . (a bit weird?) ideaseed -iT'My title' 'my idea' -.label1
• # (would be nice (it is widely used for indicating categories/tags) but unfortunately it means a comment in most shells, so no good)
• @ (same as with '+')
• = (like '.', although it looks a bit better: ideaseed -iT'My title' 'my idea' -=label1 -=label2)

[ewen-lbh]

Update: I saw that curl uses -# to turn on its progress bar, so this is totally feasible and I actually prefer it to -: