Thanks for your interest in Syncfusion product.
As of now our Xamarin Syncfusion controls supports Xamarin Forms 1.4. We will be including an Update for Xamarin Forms 22.214.171.12446 in our Vol 3, SP1 release which is expected by the end of October, 2015.
We will consider the mentioned issues in Vol 3, SP1 release and we have logged an issue report on this. We will update you once the implementation has been rolled out. We appreciate your patience until then.
Please let us know, if you have any query.