In a recent experiment, I took the Lucifer (the one from Tides of Darkness, with extra lateral turrets as beam cannons), and modified the LRed beam to try and alter the odd distance fadeout effect a bit - and make the pulsing, plasma-like 'core' of the beam a bit more pronounced. Out of all my tests, there was no noticeable difference.
So, I copied the LRed table entry three times, split up the individual sections of the LRed beam, put them in each of my test-version beam cannons, and loaded them on the lucy. This did not work. None of them looked anything like the LRed beam - the muzzle glow was wrong (which I did not modify), and none of the beam components had any of the visual quality of the original LRed. This leads me to assume that there is something cool going on outside of the table entry, which makes the LRed (and probably every other beam in the game?) look awesome.
Is this part of the beam even moddable? Or will I need to create my own effects in photoshop to accomplish this? I imagine I could make some pretty intricate-looking beam effects between enough time in photoshop and use of the tile factor and translation options in the weapons.tbl file.