The portable version of the app still writes files in the %APPDATA% directory, which is very much against the spirit of a portable version. It would be really nice to have a portable version that saves everything to a folder in the same location as the EXE, so Allusion can easily be run off an external drive.

Naturally it'd also then be nice to add support for relative paths (relative to the EXE), so the drive letter wouldn't matter when setting it up.