http://www.tweecer.com is where you get it, and yes you have access to hundreds of parameters within the EEC that you can change, Including MAF curves, and injector parameters. The documentation is lacking and you previously had to rely on the forums to learn it, but You can buy the SCT Tuning manual at
http://www.modulardepot.com/product_info.php?products_id=178 It is really for the SCT software (Much more expensive) but the parameters are the same. As far as the wideband, I went with the PLX M300
http://www.plxdevices.com/products_M-Series-Controllers.htm With all of this you can tune everything you need without having to go to the dyno. You do need a laptop for all of this to work, but not a very powerful one though, so if you don't have on you can pick up an old one pretty cheap to use.