2 Weeks and still not any closer to getting a dev response. Anyways here's a repost from another thread discussing the same issue.http://www.swtor.com/community/showthread.php?t=587930
Pretty simple method to test it yourself.
The longer the test, the greater the disparity will be. That's why my test is ideal. Two button rotation.
Ion Pulse, Hammershot, Ion Pulse, Hammershot, Ion Pulse, Hammershot, and repeat.
Count the number of Ion Pulses until you're unable to use another Ion Pulse. Repeat two more times to account for lag.
Flame burst, Rapid shots, Flame burst, Rapid shots, Flame burst, Rapid shots.
Count number of Flamebursts until you're unable to activate it again. Repeat twice more to account for lag.
Compare the results.
All it requires is at least level 10 Powertech and Vanguard (minimum level to get Ion Pulse/Flameburst). Arguably it should also work with a Merc and Commando. (Power shot / Charged Bolts) Though only when it's talented for 1.5 second cast time. (Minimum level 15).