Right, minor apple-ogies....i've finally had time to test this out
The scrollbar only appears if your local screen size is > than your remote size. Hence, if this is an issue to you, you might want to consider a larger local screen resolution.
Also, 3rd party RDP tools (specifically the one I use on my iPhone) give you scrollbars whatever the case.
RDP will never be anything but a 1:1 pixel mapping.