The bookmark can normally be changed on +R media but wether it works really does depend on your Wii. I originally burnt all my games on Verbatim +R media with the booktype set to -R but my Wii had problems with the disks. Sometimes they just wouldn't load, other times the game would load but would come up with an error during play. Got some -R Verbatim printables and copied the games to them and never had any probs since plus the printables allowed me to print onto the CD which makes the games look good.
Thanks for the replies guys, I had 10 +r and couldn't get any of them to work. I also have an LG drive and that wouldn't work either. Found one -r and burned it no probs, so I'm off to get some today.