i think most author dont like compilations for the simple reason that it takes users away from their download pages, i mean if your gonna upload a compilation of almost 400 mods then why would people want to goto 30+ mod pages when they can get them all in the one download?
Im not saying all users are like this, i myself do not download compilations i download the individual mods them selves so the author gets the credit.
Edit: also in regards to modifying mods, im pretty sure if its going to be for your own personal use then i dont think thats a problem just dont release it