Intro question - if I want to use fw1 for building new areas of a large legacy app - is my only option to hook it up to the root app.cfc and use

unhandledPaths

for all my existing stuff? Or can i hook up fw1 to an app.cfc in a subdir and just have that dir and below benefit from the framework? And assuming running in a sub dir is fine, are there any other major complications tied to running it on a small part of a legacy site? Thanks!

Yes you can have your FW/1 app run separate from the legacy app in a sub directory. Just make sure the folder name does not have a period in it or else things will not work.