Thank you for writing.
To the questions at hand,
1) When you place RadRibbonBar on RadForm and you enable the ribbon behavior, you could set the AllowTheming
property to true to remove the aero effect:
Alternatively, you could use RadRibbonForm
instead and set its AllowAero
property to false:
In both cases, when you disable the aero effect, the RightToLeft mode should behave correctly:
.radRibbonBar1.RightToLeft = System.Windows.Forms.RightToLeft.Yes;
I hope that you find this information useful.
the Telerik team