Hi Vee Tian,
Thank you for writing.
As you mentioned RadScheduler supports only Day View, Week View, Month View and Timeline View, so for the time being we do not offer quarterly and yearly views.
I hope the provided information addresses your question. Should you have any other questions, do not hesitate to contact us.
the Telerik team
Q1’11 SP1 of RadControls for WinForms is available for download
; also available is the Q2'11 Roadmap
for Telerik Windows Forms controls.