The waiter wrote:Thx for answer
I experimented with your suggestion earlier today, implementing "instant translation", just a hackish version to get a feeling how well it would work in real use.
After playing with it, I'm not sure it brings much to the table. Even if you disable all non-local dictionaries, the overall experience is not that good. The main view always flashes with new information when you type, and in order to verify whether I reached to the right word or not I need to move my eyes from the translation line to the main view, find the headword, figure out is it the one I need or not (and during that mental work I cannot type, naturally

)
At the end, A LOT more work for the computer, a lot more work for my brain and much slower search of the word I wanted to translate.
Compare to the current approach: you just type whatever you wish, and as soon as the first line in the drop down list (which is *right* before the translation line, so there is not much of an eye movement to get there) matches what you need, just click Down. The second approach beats the instant translation hands down. And it's "environment friendly", and can be safely used with online dictionaries.