0. If you are not forced to, don't use the fastest baud rate I can use... use a slower baud rate instead.

1. If all you need in order to use 11.05 is rewritimg the program with new timing values, i mean if you can obtain the very same timing criteria with a 11.05 by rewriting the program, then move your accumulator and do it.

2. If you are forced to use 19200 and can't rewrite the program for a 11.05: A slight percent of error in the baud rate is thought to be tolerable. You may use a 24MHz instead of 12MHz and Timer2 instead of Timer1, then with some modifications in the timings, The 24MHz xtall yields to slighter(.16%) baud rate errors.

http://www.keil.com/c51/baudrate.asp