With CD Architect, you can record a superlong piece, then insert track-starts within it wherever you want.
CD Architect may or may not support your CD writer, though, if it's a relatively new one... SFoundry has discontinued support for CD Architect, much to the dismay of CDA users, and is no longer adding support for new drives as they come to market. (You can read about the users' dismay on the CDA Forum on this website.)
There may be other packages that can do what you're looking to do, but I'm not personally familiar with any. Easy CD Creator lets you overlap two tracks to do crossfades, but it sounds like you're looking to do the opposite of that.
Good luck!
Ernie
Forgot to mention: CD Architect works from within Sound Forge 4.
It doesn't work with Sound Forge 5 (Sonic Foundry dropped support for CDA when they introduced the new version of Sound Forge). And I don't think it's available as a stand-alone package, either.
...all of which means that if you don't already have Sound Forge 4, you probably can't get CD Architect. (I'm assuming SFoundry no longer sells SF4, now that they're pushing SF5. And without SF4, there's no point in getting CD Architect.)
Ernie
WaveLab has a CD-burning component with the same capabilities... but it's available only as one part of a pretty expensive package (i.e., WaveLab).
Ernie