from reviewing many of the battlescene compilations, one thing is abundantly clear. . . only the shadows aren't seemingly using a generally boresight beam system (and one ancient). the most obvious other none boresight is the single beam from the G'Quan, and the Agammemnon shooting from amidships at the WS (this was covered in game with p + s minibeams). I believe there is a "similar" hyperion scene, the two EA ones could be attributed to CGI error. The Narn one is seen seemingly coming from the same barrel location as the main beam, but is just as likely to have been a CGI error. viewed through the maintbot, the first shots are pulse weaponry at a downward and about 15 degree angle from forward, then in the second shot, the maintbot number has changed, and we also see a beam. round about 6:10 http://www.youtube.com/watch?v=9ARkwIQ_AaI&NR=1. I am sure ther is another one that is almost 90 degrees off bore, and loks like it is actually slicing the prong off, but I cannae find it at present.
one thing that is clear is that both Omegas and G'Quans can angle beams downwards, so it stands to reason they could move them horizintally. Yes I am saying the omega as well, lets be fair in all this. from all the main ships we see fire, the Drazi, the Minbari, 90% of narn and EA, the WS fleet, fire Boresight or near as damnit. the shadows fire in many directions, the vorlons I'm still looking at. It is also interesting that the Vree fire vertically downwards from their ships, not at all turreted
even the ancients (bar one) are seen firing boresight at the battle of corriana.
also just a correction, I stated earluer the G'Quan is the only ship we ever see fire a dual beam. I stand corrected, we see an omega do it at the "liberation" of earth. we just see the G'Quan do it a heck of a lot more.
one thing that is clear is that both Omegas and G'Quans can angle beams downwards, so it stands to reason they could move them horizintally. Yes I am saying the omega as well, lets be fair in all this. from all the main ships we see fire, the Drazi, the Minbari, 90% of narn and EA, the WS fleet, fire Boresight or near as damnit. the shadows fire in many directions, the vorlons I'm still looking at. It is also interesting that the Vree fire vertically downwards from their ships, not at all turreted

also just a correction, I stated earluer the G'Quan is the only ship we ever see fire a dual beam. I stand corrected, we see an omega do it at the "liberation" of earth. we just see the G'Quan do it a heck of a lot more.