One of the method to extend your title character is by adding your 1st line of description to it. this can be done buy using a "."(DOT) at the end of your 1st description line. For example. title- welcome to WebmasterWorld desc1- best adwords forum desc2- blah blah blah . . this will be shown as... welcome to WebmasterWorld best adwords forum blah blah blah
but if you use a "." at the end of your 1st descp line. eg. title- welcome to WebmasterWorld - desc1- best adwords forum. desc2- blah blah blah
this will display as.
welcome to WebmasterWorld- best adwords forum. blah blah blah
(only on top page results not sidebar)
This is all i can help you with. Kindly let me know.. if i'm wrong at any point..