displaying free/busy information from remote iCals

Hello,

I would like to get an advice how to display "busy" information from remote iCal in the same way as any other events.

Imagine that remote iCal contains some public events represented by VEVENT blocks and also some non-public events which represented by VFREEBUSY blocks.

Currently Lightning displays only events (VEVENT) and (seemingly?) ignores free/busy blocks (VFREEBUSY).

Is there a way to display VFREEBUSY in the same way as VEVENT?

I'm willing to work on this functionality but I need some guidance from person knowledgable about this part of code, I'm total Mozilla/Thunderbird newbie.

Maybe something simple like translating VFREEBUSY blocks to equivalent VEVENT blocks could work? Does it make sense? I guess that this needs to be optional, maybe per calendar?

Thank you for advices and your time!

-- 
Petr Spacek