I think it would be very hard to administer your idea and many passengers miss their flights due to weather, connections etc. etc and some people can't predict what they will feel like eating the day before.
All passengers can order a special meal if they have a dietary requirement such as vegetarian or diabetic etc and this can be done on manage my booking up to 48 hours before flying.
Are you asking if there is a suggestion scheme for staff. No we used to have one but now we all have the ability to let our managers know our ideas and there are forums that you can post ideas on that our managers look at and often respond on.
If you mean for passengers. Yes. You can log on to BA.com and at the very bottom of the front page there is a link where you can forward comments to BA on.
These are my own views