The suggestion is:
Saving/Loading a treaty like you do with a blue print so you can propose many treaty fast and to multiple players/AI instead of having to put the whole thing everytime even if you want to add a bit of something to the previous treaty.
Something like a load/save screen, or, a list of the last traties proposed so you can double click them and re-propose them fast and such.
Also, another tweak would be, if you think this won't screw up game difficulty a "trade suggestion", like something that suggests you what would be a reasonable counterpart for what you're asking.
I.E: I put first that I want 8000 research points.
Then I put 100k metal.
Suggestor should say "recommened metal quantity 500k".
Don't know if this second one is a good idea, make your counts and see that yourself. I was worried more about the first one, which would be useful, at least to me. Community/developement feedback is welcome.