Extrapolated and Stretched Airy Wave Theory

Dear Sir

I am curious about Airy wave theory using in SACS.

Refer to 'Seastate manual',

AIRY in WAVE card means that kinematic will be calculated at wave crest and trough.

AIRC in WAVE card means that kinematic will be calculated at water line (No crest and trough).

Both options are clear.

However, I am curious about 'Extrapolated Airy Wave Theory' and 'Wheeler Stretching Airy Wave Theory' as shown in the figure below.

My question is 

1) Do we have 'Extrapolated Airy Wave Theory' in Seastate software ? If not, can we have in the future SACS version ?

2) Do we have 'Wheeler Stretching Airy Wave Theory' in Seastate software ? If not, can we have in the future SACS version ?

3) Is 'Extrapolated Airy Wave Theory' equivalent to 'VS' option in WAVTIM command in Wave response module ?

4) Is 'Wheeler Stretching  Airy Wave Theory' equivalent to 'WH' option in WAVTIM command in Wave response module ?

5) Is 'AIRY' in Seastate module equivalent to 'ST' option in WAVTIM command in Wave response module ?

6) Is 'AIRC' in Seastate module equivalent to 'CA' option in WAVTIM command in Wave response module ?

Regards,

Kasiphon