For my job it would be handy if the software could autodetect the serial baudrate.

Since you have developped the serial tap you could perhaps use the minimum time between two flanks on RX or TX to assume a used baudrate.

This would be for the situation that I connect to a device using serial and I know its sends data without being given a certain command (e.g. ttl on raspberry pi, marlin boards). For now I always have to change baudrates manually and check untill it results in readable text being displayed. For some devices that don't use very standard baudrates (9600, 115200, ...) it would save me quite some time