bookmarks-> imported bookmarks also displays old speed dials, but these seem to be from a far earlier sync, my guess would be from about 2-3 years back. otherwise my current bookmarks/speeddials are only available from the link you provided.
in that link, the right click context menu gives me the option to add a folder to my speeddial. this however has no effect afaict, opening the context menu again however, gives me a new option of removing the folder. weirdly, I added the folder "forums", however now the context menu gives the option of removing the folder from speeddial for all other folders in there (my "daily" folder, "awesome" folder etc). none of these folders appear on speeddial.
Also, the link you provided gives me a choice of two machines, one being my old system with its bookmarks, one being the new one. There is no obvious way to import the old bookmarks that I can see.