I have only been using adwords a short time so I am no expert but on trying it out recently there are a few things that I would be interested in them adding.
1. Easy populate - users of OSCommerce will know this - It is and excel document that you can upload a load of information in without having to use the web interface. ALthough Easy populate is designed for OSC I am sure google could come up with a similar sort of thing.
2. Moving of campaigns - I tried tested campaigns out and some worked, some didn't but when I tried to move the useful ones I lost all my data.
3. Adwords affiliate - Whereby the person who registers the account could get a smal % of each click even 0.1% would do. PLEASE - I could earn monay and my bosses wouldn't even know. Don't suppose there is any chance of this is there?