If you're untrailed and it only boosts you, then how can you be Light Side or Dark Side? The Force is the Force, it's how you use it that makes you Light or Dark. The Dark Side is not it's own Force. And if it's only there to boost your reflexes or something, then how is that light or dark? I would think Jedi need fast reflexes as much as Sith do?
It's a definate mindset in each case. Jedi get their focus in a Zen manner of peacefulness, (Qui-Gon Jinn resting before forcefield drops), and the Sith focusing their wills through passion, (Darth Maul pacing and slapping at that forcefield with his saber). In the Fett trilogy, I read numerous occasions where he got miffed just before doing something incredible.
Not being able to take anything from non-movie sources kills my argument, though, and makes Lucas the first and only authority. This suits only him, and he is the man who concealed Jason Wingreen's identity from us, and later denied us of that amazing voice altogether, neutering our esteemed hero.
"Be Like Boba." J. R. Duart -2006
WWJD - What Would Jango Do?