I believe there are many palms out there that suffer from something similar to the tap bug: instead of a dot the digitizer sees a line that ends in the position where the stylus hit the digitizer.
If you use quicktype you will get false uppercase letters or one of the other "stroke" letters where you really wanted the plain letter.
I now have my 2nd m500 which suffers from this problem. If you don't examine your palm carefully you won't notice. You can use either teal Echo or the built-in notepad to check for false strokes. I believe many more palms have this problem, but the owners belive they don't tap well enough to use quicktype. Graffiti recognition also suffers from I->L, I->C or T->Z substitutions.
Now there was an ancient posting on usenet called "development opportunity" where the suggestion was made to fix this with software. Since the false strokes are usually very quick ones, one could replace a quick stroke by a single dot while leaving the slow strokes as they are. There is a similar (but infrequent) problem on pen-up which may be harder to fix, because there the starting point of the stoke is the correct dot.
When the posting was made obviously noone started to develop such a hack.
Now maybe it would be a simple feat to build that into quicktype.