My opinion :
LimeSurvey put
WCAG 2.0 compliance
in README, i really doubt it's true on public part (and sure it's false on admin part) THEN : you can/
must report A11Y issue
There are already some issue reported showing poorer functionality in the new version than in the previous one :
must be reported
I can fix some part in skelvanilla, but 1. I can not fix whole, 2. It's better if it's for all theme
