This wasn´t a problem for me so far, but since i use MSF I encounter this problem more often... because of the Envelope and/or LFO windows (they´re pop-ups)... it would be amazing if the keyboard input wouldn´t be stolen even with the pop-ups open... it would be super convenient to play the keyboard and adjust the envelopes at the same time...
So now you may say, i should use a MidiKeyboard... but I´m 100% in the Box, have no Hardware and by all means I´m no live musician... (I play intermediate the Piano so i know my way arround a keyboard) but nowadays I design songs, I don`t play them... so I "program" mostly in the sequencer but during sound-design I play the "QWERTZ-Keyboard"... and don´t see the need for a waste of space infront of me...
