yes and no!
while you cannot change the machine's design and add another rinse since the imer controls how many after rinses there are. The cycles have purges between segments which can be modified to add more water to them and thus spray water up on to the dishes to rinse off any soap and soil residue that might remain on the dishware.
I have done this, and I think a fe other members have tried it as well.
I have removed the flow washer in the fill valve which will allow the full force of your water system to fill the machine very rapidly. You then depend on the float switch to stop the machine from overfilling. You will also be adding up to a gallon of water to every fill segment during the cycle so your water and energy consumption will be higher. The heating portions of each segment where the timer stops advancing until the water gets to the specific temperature needed to satisfy the hold thermostats in the fill and sani-cycle. Therefore, the cycle times will be longer.
Another problem is that since the water level will now be just below the door sill on the inside of the tank, should you open the door to add an item or check on things, if you dont wait at last 5-10 seconds before latching the door and resuming whatever action the machine was doing, you will likely blow a decent amount of water out of the bottom of the door on to your floors. So again, you have to be careful and be wary for what you wish for. Also, if you ever took notice, in between washes and rinses and after a purge, the machine basically drains all the water out. If you eliminate the flow washer, then some will remain to begin the next segment since the drain interval is designed to evacuate less water.
One advantage the lower level machines with the external timer knob have over the Superba is that you can put your detergent into the prewash section, run your cycle and then go back to starting the cycle again. In this way, you can make that your main wash and repeat it to match the soil level and then let the machine progress from there to complete the cycle and all the rest of the fills will actually become rinses. I think you get the picture.
On the Superba, you can do the same thing by putting soap into the prewash cup and letting it do its thing but interrupt the cycle just before draining and hit cancel drain button. Before the timer gets to the actual drain, you can hit quick cycyle or the shortest cycle you have and then hit the light china and energy saver dry and let the unit complete the cycle and then you could restart the machine with the deterent laden water and let the selected cycle begin and you have a good wash and then multiple rinses.
If you want to control how much water goes in if only removing the flow washer, you can put a ball valve in line witht the water supply s you can vary or control the speed at which the machine fills.