Harsh, but truthful.
You did blow off one of my greivances and that IS NOT okay. I'm going to assume your experience in this kind of RP is limited, so I'm being a bit more lenient then I would with someone who's got experience(and I know they have it). So let me be clear: If a GM has an issue with something you discuss that issue with them, and try to come to a mutual agreement. If the GM says it's one way or the other though, then that's how it's going to go.
We WILL NOT allow IC development of stuff like the metals you are proposing. That's really because of the reason Perigrin listed.
On the whole PM thing, I'm fine if you want to discuss an issue over PM, that's fine. Sending me three(I think) PMs that are only to remind me of the thread that we should really be discussing hte issue in has been updated.
Also yeah if you want the metal to be limited then come up with a better reason then 'we aint telling' because it's not going to fly. Shroom Steel is limited BECAUSE it's made of their dead. not because they don't tell anyone.