The reasoning why there's no "question mark" or "exclamation point" tags on this site is because the majority of pictures where those could apply are already covered by the "confused" and "surprised" tags respectively.
Same reasoning as to why our site doesn't have 1girl/2boys/3others tags, since the fem/male/futa/andro sub/dom and multiple_girls/boys tags cover them.
If you still want to push for it, head to the Official Tags Thread,
forum #51288, since that's where talk of tag creation and debate should be done to avoid forum bloat.