How strange is it to want to spend three years on a Master's degree to take an extra six courses? A lot of programs have different curriculum for introductory PhD students vs introductory Master's. I want to be able to take some of those PhD classes, and I want to have spare room for exciting electives both within my Master's and outside it in associated fields.
When is this not possible, and does spending an extra year in a Master's program sound bad? I'd simply end up spending all my time self-studying the extra material after a two year degree anyway.
Edit: I don't know how I'd feel applying for a PhD then dropping to a Master's in a couple years to have a separate core sequence. I don't want to waste anyone's time.
Edit: I'm not enrolled yet. Funding would hopefully be a combination of resident tuition and a TAship/RAship.