I oppose this (non-standard Shift)-click:
Standard SSI
ctrl-click selects additional single items
Shift-click Select the range from initial to current
All of a sudden you want to introduce a totally different action from the standard. (I find the Shift click behavior to only indicate that a Range is being rejected, both selections are still valid, with the intervening ones failing to register)
AFAIK
Ctrl-ALT click combinations are not a
standard
I will endorse Alt+ clicks in the tag browser to be
Meets ALL and
regular clicks
Meets Any