I'm sending this here because it is language related, sorry if this is not the list to post it.
First I see that for the Spanish language we are having iso-8859-1 instead of iso-8859-15 which would allow us to use the euro symbol and all that.
Second, I see an anoyance when running lists in a country that different language are used, or even with certain mailers alone, the problem is this:
Suppose I have a list which default language is using charset iso-8859-1, then somebody comes and posts in iso-8859-15 and you get it all in three mime parts, one for the header, in iso-8859-1, one for the body in iso-8859-15 and then the footer in iso-8859-1 again. This seems quite anoying, at least when yo look at it. I was wondering if there is, or if it would make sense to add, something so that this doesn't happen.
Also I see something that is for sure doable, and it is that when the same person writes with some mailers like mutt and doesn't use any 8 bits character, then the mailer would encode the text as us-ascii, which if I'm not wrong, should mix ok with iso-8859-1, I mean that the hole message could come as one using iso-8859-1, and that is not done right now.
Well, just a couple of ideas, that's all.