ewwwwww, bromley. That's an interesting question you pose there.........LOL
I'd say "yes" about the unethical side of the equation (i.e. that it definitely is unethical, in my sole opinion anyway). Even if I do understand why you might consider it, due to your concerns of having to wait too long for therapy, I'd still personally advise you (for what its worth) to consider another avenue of persuasion.
Frankly, wouldn't it be more productive and honest to simply ask your neuro if s/he would mind watching your condition more closely for evidence of a second attack or continuing damage (which as you say, can be happening even without symptoms), precisely because you do wish to get on Antegren (or something) as soon as possible to prevent any possible further damage?
I'm not sure you could "fake" an attack anyway. You can't fake optic neuritis, because that can (and cannot) be detected simply by them looking in your eyes; you can't fake weakness, because little did we know, but they have methods to determine if we are faking or not, depending upon how much pressure they place on us when they do those neurological tests (i.e. push on my hands, up, down, sideways, etc.); tingling, numbness, etc. can't be "proven", but doesn't necessarily indicate a new "exacerbation" anyway; faking balance issues MIGHT work, but man.......the neuros know what they are looking at, again causing me to truly believe they'd catch a faker; and having an MRI performed wouldn't prove a second attack unless you WERE having a second attack (possibly), especially if no new lesions showed up. Even spasticity issues can be "felt" by the neuro and they know what to look for there, also.
Perhaps you could complain about the tingling, numbness, MS hug, etc. symptoms for more than a few days in a row, but you'd be more likely to get a steroid first, wouldn't you? And who wants to undergo steroid treatment for nothing?
I'm curious, how WOULD you try to "fake" a second attack?
(I still opt for the honesty option myself.)