Visual Assist build 1734 and newer
Suggestion lists display only five items when they appear, and then resize to display up to ten items if you press Up or Down to scroll through a list. To disable the automatic resizing, set the following BINARY value in your registry:
HKCU\Software\Whole Tomato\Visual Assist X\<IDE spec>\ResizeSuggestionListOnUpDown = 00
Set this value to 01 to re-enable resizing.