Looks like JRemote for Android will not have booklet view in the forseeable future, so I've bought MO 4Media. And what an improvement. It lets me view booklets at last - simply click on the track and a list of options opens: if there is a booklet "View Assets/Extras" is at the top of the list. Click on this option , pick Booklet and the booklet opens in a new window. Brilliant.
Plus the not inconsiderable advantage that it's rock solid and doesn't keep falling over ever few seconds, as JRemote currently does. Money well spent, and a new lease of life for my JRiver program