I figured if anyone could help me answer a few questions, it'd be you guys, so here goes.

I have a 2009 s40 that has a whooping 105 miles on it as of tonite. (Slow but I WILL get there....)

Anyhoo, I am wondering some things. One is that my neutral position almost feels like a gear all by itself. Often I have found that when I shift up to 2nd, or down from 2nd to 1st, that I am in neutral. And I'm not just tapping the gear shift. Granted I am not wrenching on it but I am wondering if this is something that will "loosen" up as I get more miles under my belt?

I was also wondering why my bikes "pops." It almost sounds like a backfire. Its not all the time, but its enough for me to notice.

And lastly, once I hit about 65 on my girl, its obvious she is struggling (I'd like to go at least 70 so my hubby won't leave me in the dust.) Would a jet kit take care of that for me, or would I need to invest in a new air filter/pipe as well? I want to keep my investment into this bike low since I might want to upgrade to a vtwin next summer.

Thanks in advance for any input.  

Shifting will get smoother as it breaks in,... and as you become more accustomed.
Savage is famous for it's pops and backfires,... you'll grow to love them.
It should have no trouble doing 70mph,... but your bike is not broken in yet, so be gentle with her for a while.  Try to keep the revs under 5k, or so, and maybe talk the hubby into a couple hundred miles at 60 and under.  Don't ride for long periods without varying your speed a little once in a while.  Break-in should take about 600 or 800 miles,... then do an oil and filter change.  It will have some metal shavings in it,... that won't happen much after the beak-in.
Ride safe....