Hi..
I do a lot of all the options - pure fingerpicking, strumming, and fingerpicking whilst holding a pick betweein thumb and first finger (ie. using the other ones to fingerpick)... whilst the essence of sticking a microphone near your guitar and pressing record on your DAW is the same, there are many other things to be aware of - a short list below - all of these are issues for strumming as well, it's just that they can be more critical when fingerpicking.... mostly they're technique issues to do with your playing, rather than your gear...
Pure fingerpicking is (usually) quieter than strumming - as such you need to keep on top of a fewthings that you're not so worried about when strumming a raucous pop song:
Breathing - if you're watching your fingers as you're playing, your mouth is probably pointing at the mic, roughly... it will pick up loud breathing noises if you're using a condenser. You'll need to learn to breath slowly, deeply, preferably through your mouth (quieter) and quietly, and stay relaxed.
String squeak - can be a nice "feature" or completely ruin the mood. Reduce by (a) practice, practice, practice (b) frequent hand washing in warm water before takes
Incidental noises from your interaction with the guitar - so you need to be careful you're not tapping your feet on the floor (audibly), tapping the guitar accidentally (if you're doing it deliberately, fine...), getting squeak from resting your littlest finger on the pickguard, having clothes rustle when you move whilst playing, having the chair you're sitting on squeak, and having finger and thumb joints crack whilst you're playing (seriously... my cracking thumbs have ruined many a take...)
Finger/string noises - if you're using your fingernails, at least in part, then depending upon the angle of your hand and your style, you will get your nails dragging down the wound strings a bit, rather than directly across them. This generates a noise that you may seek to reduce, depending upon what it is you're playing. That's a technique thing though...
The effect of using your thumb/other fleshy bits to hit a string - if you're using your thumb (the actual flesh) on the lower (pitch) strings, it will have a bassier response than strings hit with your fingernail - it's very easy to get carried away with the thumb and have it drown out the higher pitch strings, resulting in an overly bassy take that really can't be used. This too is a technique thing that can only be learnt by recording, and listening back, and adjusting...
And the other thing you need to think of is that the sound of fingerpicking is quite different from strumming... so you probably will need to change mic position from strumming to picking - again, test and learn on this one. Because the volume is lower, you may tend to move the mic closer, and this can in itself be a bad move, depending upon your guitar and gear as if you're using a cardiod pattern, as you probably will be, this can increase the bass and that, as previously mentioned, may be something you need to work on to control anyway .... but experiment and you'll work it out - a low noise floor from your gear and a low noise environment are really helpful..
Good luck...
PS.... as an Australian, I'm well aware of Tommy Emmanuel... and I have the obligatory DVD... scary what he gets up to!
) that would be very different in these two factors as a minimum compared to fingerpicking on my porch. You are right, the mic would not care, but most likely would not be able to produce sound similar to the mix you find on Tommy Emmanuel's albums. 
