BTP- inputing mineral salt values?

I cant figure out a way to input new mineral salts in the water chemistry window.
I have clicked on new, and then a window comes up where I can name it, pick the type, and give it a price.
I am hoping for something not so one-Dimensional. Something that I can input all of the individual ion values for a given amount. IE:
I just bought some burton salts from morebeer which have given values of gypsum, sodium, etc. I would like to be able to add that Set to acheive my desired mineral profile.
If Im missing something or someone knows a work-around, I would appreciate it.
Thanks

What about setting it up as a Water Profile, that would allow you to enter the mineral profile.