Disable Focus on Captions in Webclient

Hi!
Our customer updated from NAV 2013 to NAV 2013R2.
They decided to go for R2 mainly because of the improved webclient.
Now, one thing is bothering the users:
If you TAB through the fields, the Captions are getting the focus which they did'n in NAV 2013 (I think due to the tooltips).

a) Is there a chance to Switch of focus for captions?
b) Can one let users skip certain fields when TABing?

Thank you for your reply.