I just loaded up 1734, and I could not get the new Suggestion List behavior to work.
Looking through the registry file, it appears that the new keys listed in http://forum.wholetomato.com/forum/topic.asp?TOPIC_ID=8981 do not appear in any of these locations: VA6|VANet|VANet8|VANet9. I tried pressing OK in the VAX dialog, and restarting VS2008. No luck.
VA_X.dll file version 10.5.1734.0 built 2009.09.02 DevEnv.exe version 9.0.30729.1 msenv.dll version 9.0.30729.1 Font: Fixedsys 13(Pixels) Comctl32.dll version 6.0.2900.2982 Windows XP 5.1 Build 2600 Service Pack 2 2 processors (x86)
In build 1734, you will have to create the values yourself if you want to try different behavior. For VS2008, you need to create the values at: HKCU\\Software\\Whole Tomato\\Visual Assist X\\VANet9