You will probably be at a disadvantage though. If you were to join a 2 year program, you would be categorized within a year of entering the program. You would really need to work hard to get your scores up, mainly the commanders rating. It's not impossible though, seen it happen.
One time a cadet joined the two year program, but talked to the det early...the cadre pushed him through a 1 week crash course on AFROTC and somehow he got bumped into a 6 week FT slot the summer before he even started ROTC. He ended up graduating DG. Didn't go pilot route, didn't want to...but he did get AFIT right out of ROTC which isn't easy so i hear. Don't get your hopes up though, with the way they are screening people before getting FT slots, I doubt they will do this any more. Talk to the det though, who knows.
This past categorization there was a pretty high percentage of people who wanted rated get it. Our det we had like 13/14 people get pilot nav that wanted it. It was a good year for ROTC, and I think I read somewhere that ROTC was getting more NAV slots for the next few years, thanks to the academy.
IMO go ROTC, enjoy yourself. If you want it bad enough, you should get it. If you don't end up getting one, you can always try after going active.
In reference to c17wannabe: I was always told ROTC was the easiest way, even above academy...mainly because while they get more slots, typically more (% wise) want pilot slots...and then you add on the large cadet body, which I assume would affect commanders rating. Who knows though, just heresay. Any thoughts?