http://mopreme.livejournal.com/458.htmlHere are the circumstances where Ken can do 2 jab Shoryukens.
Midscreen:
Strong fierce Shoryuken Shoryuken
- Q
Stand strong/low forward Shoryuken Shoryuken
- Necro, Elena
Stand fierce Shoryuken Kara-Shoryuken
- Chun Li, Makoto, 12, Necro
Stand strong/low forward Shoryuken Kara-Shoryuken
- Ken, Ryu, Akuma, Sean, Chun Li, Makoto, 12, Necro, Urien
Corner:
Strong fierce Shoryuken Shoryuken
- Ken, Ryu, Akuma, Sean, Chun Li, Makoto, 12, Necro, Urien, Elena
Strong fierce Shoryuken Kara-Shoryuken
- Remy, Ibuki, Hugo
Stand fierce Shoryuken Kara-Shoryuken
- Yun, Yang, Oro
Needless to say, if you can do chain combo or stand fierce into double Shoryuken, then things like low forward work as well. If a character is at the top of the list, then all things below should work as well.