Currently there are three answers for the crossing quest: Traffic signals, 'uncontrolled' and 'without road markings'.

Nothing seems to fit right for this type of crossing, which might have or have not markings on the road for the path of pedestrians and might be a physical island or just a painted one.

It would be nice to collect more specific informations on this quest which should help visually impaired people to navigate.
Additionally I'm not sure what a 'crossing without road markings' actually is. A logical crossing which has no infrastructure at all? 馃
The right answer is "crossing without markings" here.
Soon there will be a quest that also asks if there is an island.
"uncontrolled crossing" is named confusing IMHO. It should explicitly ask for 'zebra crossing' there.
Then there are crossing with lines on the road and some who don't have them.
All 4 types:
traffic light controlled

zebra crossing

crossing with lines

cossing without lines

can have an island in the middle - which can be just painted or out of stone, like this zebra crossing:

And all of them could have a dedicated lane for bicycles :)
But those details would be two different quests I guess - as you recommended.
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Soon there will be a quest that also asks if there is an island.