For the time being you can use the following workaround:
CSS:
	<style>
		html span.RadButton_MetroTouch.rbToggleButton .rbText,
		html span.RadButton_BlackMetroTouch.rbToggleButton .rbText {
			padding: 0 25px;
		}
	</style>
ASPX:
			<telerik:RadButton ID="telerik:RadButton 1" runat="server" ToggleType="CheckBox" ButtonType="ToggleButton" Skin="MetroTouch"
				Text="Click">
			</telerik:RadButton>