Not sure if this will solve your problem but maybe it will help a little?
in the BeforeClick event you can set Cancel = True to cancel the users click. (either Right or Left Click)
This would disable the left mouse button on the map itself (prevent them from moving the pushpin) If you change it to Button =2 then you disable right click menu. If you remove the if statment and just leave Cancel = True you disable left or right click.
Code:
Private Sub MappointControl1_BeforeClick(ByVal Button As Long, ByVal Shift As Long, ByVal X As Long, ByVal Y As Long, Cancel As Boolean)
If Button = 1 Then
Cancel = True
End If
End Sub