For my experience there is no way to capture a radial  To or from a VOR, the only way to capture the radial is to engage the FD auto GS and it will follow but not really straight and doing some zigzag.
I have also a problem with the trim setting but maybe is my lacks of knowledge, when I set trim  the aircraft dosen't  keep my input after scroll it goes back.
Also the FD attitude dosen't work.