"Hardcode it for now so the client can test it, then we'll fix it later."

Never fixed.

If the client already paid, why bother?

I did this for a client. Hardcoded all the graphs and shit. Hoping they wouldn't teat the settings... they did

But I was smart, I had hooked up the settings so it'd throw an exception on change. So I could tell the client something was wrong bla bla bla, and I'd go fix it

Later equals never. keep that in mind

Well if it can be hard coded and the client is okay with it not being configurable it should be fine.