Can't add or see flags using Zoho Mobile Sync

Can't add or see flags using Zoho Mobile Sync

Having flagged emails in IMAP on Apple Mail, I pick up my mail on my iPad only to see that none of the flags are there, I also cannot flag emails over active sync. 
I believe this is an issue that needs some attention - its a simple function that works over other active sync implementations, and I'm not sure why it hasn't already been implemented on Zoho Sync.
Do you have any idea when this will be implemented?

I'm also waiting patiently for you to release Caldav and Carddav so that I can sync all my contacts and calendars with both my MacBook and iPad/iPhone - what is the ETA on these?