See, I think it already fits pretty well in lower-power packs (usually ones focused around dimension mods). It's just that FTB isn't one. There's a few things I think are essential for mods of your type to fit in with tech mods:
And if you add things drastically more powerful than the current norm you can always have a config for it. I just feel it's a damn shame that a great concept like Metallurgy can't really work in a tech pack.
- Special Effects: Right now Metallurgy to my knowledge is a bunch of really powerful, but overall similar tools/armor. There are a ton of things that could be added to specific metals to help out. Autorepair? Autosmelting/grinding? Extended range? Electric? AoE? Insta-mine ore/gravel veins? Significantly better at mining weak/strong materials? TELEPORTATING THROUGH WALLS (*cough*ender metals*cough*)??? Heck, you could even add these to basic metals and as you combine them they get both effects.
- Overall power level needs increasing if it's going to be in tech packs, but I already mentioned this.
- Non-tool/weapon/armor utility devices. Every great mod has at least one device that makes it special.
See, I disagree with this for a big reason. When I take "balancing" into account, I use what most people consider the "core" tech mods and do comparisons. These mods being IC2, TE, BC, Forestry, Railcraft, etc. Not what I consider "Feature" mods like MMMPS or TiCo (which TiCo support is being worked on.)
Metallurgy, in itself and with the planned changes, fits in with the general gameplay of these "core" mods. Albeit in a different way atm. Once M4 is released and a well made API is in place, more support will be done by the "Feature" type mods.
I'd rather see the development of M4 go down the "core" type route and let others implement the "Features." If you look at the number of add-ons, or mods that extend mods like IC2 or BC, it may be the smarter thing for M4 to become instead of doing it itself. This gives other mod authors breathing room for designing their mods to work with it.
Edit: Also, M4 has the potential currently to fit in as a "core" type mod for other themes of modpacks than just tech. Magic and RPG type packs can greatly benefit from the vast array of metals and tools currently offered. Esp if mods like Ars Magica 2 or TC4 take them into account.