Chaos: You could create such a maximum by setting the increment field to 0. (Then the Fisher clock reduces to a "normal" chess clock).

IMO, such a move pace is totally out of place in BK - unless players play at the same times, it's very likely to give one player a huge advantage clock wise. (Say you always play between 12AM and 9PM, dedicating 9 hours a day playing BK. I only play 10 minutes a day, from 10PM till 10:10PM (time adjusted to your timezone). You will then have a serious risk of losing our game on time, while I will not. Simply because there will be 14 hours between my move and your first opportunity to move, and only 10 hours between your move and my move. I will gain 4 hours/move on the clock - even if you are a much more dedicated player than I am).