After I edited Does the probable heat of nanotech universal constructors make it infeasible in home environments? I noticed that the editor had altered 10^12 to 1012. While trying to fix this the editor told me I needed to change at least 6 characters before I could save the edit. In this case I had to make some other trivial changes before I could save it. I understand that normally making only a change of a couple characters probably means the edit is not worth making, but in this case there is a big difference between 10^12 and 1012.
Maybe you should ask a confirmation question on short edits, or just rely on the editing queue to get rid of trivial edits rather than banning them entirely.