You can use other software to map the qwerty to midi notes. If you have an internal midi loopback or midiyoke then you can route the qwerty output of the software to BFD. Check out http://www.bome.com/products/mousekeyboard or http://vmpk.sourceforge.net/ it's freeware. There are others available also. You would have to make a drum map in BFD to correspond to whatever qwerty keys you want to use. Mind you, the links I provided are for windows.
Forgot to also mention that if you have an IOS device or tablet or such, I use mididesigner pro on an Ipad, there are plenty of others and free and midi designer has a lite free version also. I have pads and sliders on the ipad midi designer that trigger BFD and sliders control, trim, faders, any thing you want to set up via wireless midi. On the pc you need rtp midi, http://www.tobias-erichsen.de/software/rtpmidi.html most but not all ios programs go wireless midi, be sure to check. Like I said I use midi designer pro. Works great, I can remotely control BFD hits, mix anything I want, sitting infront of the computer or in another room, as it's wireless.