Just being over cautious I suppose.. didn't think it right through... but yes it would over write if you said yes...
I love my function Keys, I really believe its the best feature in microstation...
So good I have to use a card board overlay to label all the functions I use and I have also saved a few custom ones for special project jobs I have to do throughout the year for about 4 weeks solid every day.. really speeds up the work flows ...