Hi Brad, thanks for your reply.
First let me congratulate you on a great program. I made my first AG only a couple of days ago. While working out my recipe, just being able to change my grain bill and have have my mash and sparge volumes recalculate automatically made it worth my $20, let alone all the other great features. I also read elsewhere that you regularly participate in the the BeerSmith forum and seem very interested in responding to comments and improving the program. Beersmith is often recommended at the homebrewtalk.com forum which is where I heard about it.
I've just moved from Melbourne Australia to Montreal so I'm not really an authority as to what the common way to buy hops here is. My LHBS sells in 28g packs, but I just had a look around some other Canadian homebrew supply websites and most seem to sell in ounces. Canada uses the metric system as does Australia, but I wonder if hop weight is one of those things that still hangs on to the imperial system. In Australia I always bought hops by the ounce even though I bought other ingredients by the kilogram. Other things in Australia like the length of a surfboard or a sail boat were usually expressed in feet or feet and inches. People just seem to be more comfortable using the imperial system for some things.
That's great about being able to add a formula to the price and other fields. I think the easiest thing for me though is to just use ounces for hop weight. As I said I'm used to that anyway, even though I hate trying to use gallons and pounds. As to what is a common metric weight to buy hops I can't help you much there. Everywhere I've been or looked at on the web, except for my LHBS, is in ounces.
My opinion on how to improve the program to resolve this is to add the ability to choose the price per weight ratio. So if the user wants to specify $/28g, $/100g, $/kg etc he could. I'm not really sure if this is worth a lot of effort though, especially if other more valuable feature requests are still pending. And as far as I know my LHBS might be the only place in the world that sells metric quantities of hops anyway.
Cheers, Jaf.