Roadrunner has added the long handle to his Oasis as shown in the image below.http://i43.tinypic.com/281i7a.jpg
I will be installing one on our 2009 Oasis before we start using it again this spring. I think RR has installed Hobie's front carrying handles on the sides of his Oasis as a semi panic grab bar. That might be a good thing to have while soloing.
Some have put lead shot in their cassette for some of their ballast, and that is probably the best use and only good use of the cassette after you get home with it. After you put the lead shot into your cassette, you can use it as a door stop.
Others use water bags which are filled at the launch site. That eliminates carrying 30 to 50 #'s of ballast in sand bags to and from the launch site.
I think that Stobbo has some good input re solo use of the Oasis.