Thank you for your questions.
1. RadChart for Windows Phone
doesn't provide legend out of the box like for Windows 8, you need to implement it on your own.
2. I managed to reproduce the issue with selection in landscape mode and we will do our best to provide a fix for it for our next Service Pack, expected in 2 weeks. I have updated your Telerik points for your report.
Have a suggestion or face a problem - you can use the Ideas & Feedback portal
to submit ideas, feedback and vote for them.