As far as I know the Waverunner 2 comes with full sample memory,same as Wavepro. I looked into the service manual and did a search here (there is a member with a strange user name who seems to really know these scopes inside out and who seems to have provided most of the information about them, but it appears he has been banned?), and everything I found confirms that the sample memory size is software configurable as on the Wavepro.
I probably should try higher option code numbers, i.e 01-00000010, but to test them out like that will take forever.