Synthetic AT Fluid

[rawaudi@frugal.com (Robert Wheeldon)]

Does anyone on the q-list have an opinion about switching to synthetic Auto
Trans fluid.  I'm considering it but I cannot (won't spend the money) drain
the torque converter.  My thoughts are drain and re-fill the trans several
times until I end up with something better than a 50/50 mixture of original
fluid and synthetic. 
Questions

Will regular AT and synthetic AT mix?
Is there any advantage to synthetic AT fluid?
Is there any advantage to mixed conventional and synthetic AT fluid?
Is there a way to drain the torque converter short of pulling the transaxle

TIA

Regards,
Robert Wheeldon
'90 V8Q
Principal Engineer
Boeing Commercial Airplane