The issue with the complex ATC voice commands could be that windows voice recognition does not do very well with long complex sentences. The shorter the better for the voice recog. One thing that could fix the issue is if the ATC does not understand they could say something or allow a manual TEXT entry to reply to ATC so that you can get the flight moving along. It took me quite some time just go get to take off even though Ive used ATC before on Vatsim and on Vox2ATC, PilotEdge etc. While there are set ATC statements sometimes ATC can be a bit open with how you speak especially at smaller airports. So perhaps a text option would improve the misunderstanding of the program via windows speech recognition which in itself is nice, but not a very good program in my opinion for recognizing speech
Cheers on the great program.