I'm afraid the multi-sheet printing only support a maximum of 5 pages at present If you need more detail than this you could split the route into two. The easiest way to do this is to save 2 copies of your route, then use the "Delete Section" feature under the Plot menu to delete the first half of the route on the first copy and the second half of the route on the second copy. This will enable you to print your route over a maximum of 10 pages.
Hope this helps.
I have just plotted a 60-mile bike route ... is it possible to print it out using more than the 5-Page option ?