In the vid for the early light tower, you made a 0-char file. Is that necessary, and if so, is it possible to make that file be hero mode?
Not sure about being able to load the other file. The only reason you'd do it is to save like 2.5 min activating BiT the first time. Unless there will be some glitches that require you save the 100% file elsewhere. If you can load the other file, when would timing start, since you'd load that file before you run your main file.
Kazooie and I did some research and we managed to optimize the light tower trick into this:
http://www.youtube.com/watch?v=XYT1DaCP8bcIt does not require a 0-char file (not a unused BiT file that is), so we can use a Hero Mode file to do it.
And I wouldn't say 100% file since we most likely wont use a 100% file. We'd use a set up that allows 1 file to do the light tower early, the skykeep early, AND one of the light columns early tricks. This file can't even be 100% actually. I'll make a simple video of how to create such a file later, it is quite simple.
There is no need to ever load these files during a run, at least I can't think of a reason. Or, well, actually, it could be used to activate BiT for the first time faster. (load it and kill yourself with a bomb + sword slash).