hm... ds2key 0.4 has much more delay than 0.3.
i'm still using version 0.3 which enables a nearly perfect control when using an emulator. perhaps the problem lays by my pc & router or someone the same problem?
however a great and usefull application
Me nor Sypherce could detect any delay in the use of 0.4. I played Stepmania with it for several hours, and the button detection was as perfect as it's always been. Perhaps it is your computer or router?