I don't think it would do anything because your username appears in bold, while your tripcode is italicized. If you just copypaste a tripcode into your name, I imagine it would be bold and clearly not a valid code ;P but that's just a guess.
>>2 If you copy the tripcode, it will scramble the already scrambled code into something else because of the !. It won't copy the tripcode, because HTML doesn't work in the Name field.