Implement functionality, that allows to download the plugin as one file (and not only github copy).

"Must-haves" IMHO:

1) Inclusion order for files (to make sure dependencies are correct).

2) Optional "YUI compressor".

2.1) Configure which headers to keep (license and author is always a good idea because of copyright), or possibly an optional header.

I have a plugin that uses several classes and I would not want to include them one after another for obvious performance reasons.