I always wondered if they make toilets with a food disposal type device. It would be a great idea 
Yes...they do...it is called a "macerator"
There are two forms:
A) There are ones meant for whole houses. They are used in communities with pumped-pressurized sewers. They appear like small septic tanks. The have a macerator/pump combination that grinds the ...."solids" into a "slurry". Some commmunities that use pumped sewerage systems have several houses share one macerator.
The advantage of pumping sewerage instead of gravity sewers:
- 1) The sewers are only three or four inches in diameter
- 2) The angle to which the main sewer is built is not critical.
- 3) You don't have to open up the ground nearly as wide or deep to build the main sewers.
So the cost of building sewers is greatly reduced.
On the downside....somewhere a Bhubba with a backhoe is going to pierce the thing and sewerage will come rushing out under pressure.
B) The second form are the toilets meant for basements..
