I could offer Flacco and Jamal Lewis for Gore too. Not sure if he would take that though. Only QB he has is Romo, who's on his bye this week. I don't need Flacco, got Schaub and McNabb too.
His RB's are Gore, P Thomas, SJax, J Jones, J Stewart
My team- QB-Schaub, McNabb, Flacco (start 1) WR- C Johnson, S Smith (NY), Sims-Walker, A Gonzalez (start 2) RB- M Forte, S Slaton, R Grant, J Lewis ( start 2, plus 1 flex) TE- C Cooley K- M Crosby for now, was N Folk D- Jets
I'm in a similar situation -- trying to turn my back-up QB into a RB upgrade.
I definitely wouldn't do Flacco/Slaton for Gore -- given Gore's health, I'm not even sure I'd do a straight-up Slaton/Gore deal. You're right that he probably wouldn't take Jamal Lewis, though it couldn't hurt to use that as a starting point.
If he doesn't make a trade, which QB would he be able to pick up? That's really what you're negotiating with at this point.