simply adding effects will not affect the sync.
if you change the position of the clips/audio it will.
WMM options should be similar to WMM2 options, in which case you should look at this
if you still don't see the options (I've played around with WMM briefly so I know there are other optiions...but now it's dead not like it's that much of a loss
) then you could just get WMM2