Yes good idea, you can create a DrumGrooveUserNames.txt that you write the data to as well as DrumGrooveNames.txt then when PG update DrumGrooveNames.txt you can make a bat file to copy all the text from DrumGrooveUserNames.txt to append DrumGrooveNames.txt

UserDrumGrooveUpdate.bat
Code:
type DrumGrooveUserNames.txt >> DrumGrooveNames.txt


for Mac
UserDrumGrooveUpdate.sh
Code:
cat "Applications/Band-in-a-Box/Data/DrumGrooveUserNames.txt" > "Applications/Band-in-a-Box/Data/DrumGrooveNames.txt"


Maybe suggest here Band-in-a-Box Wishlist