Different Printing Speeds

Hi,
When I’m printing on my A1 Mini, I like to change the speed of the print so that it can be done, say, before I go to bed so I can start another. With the firmware on my printer, it only lets me change to 4 speeds: 50%, 100%, 126%, and 166%. Not only is this extremely annoying for trying to set it to the right time, I also find the values they chose weird. Why 126 and 166? I think it would be really easy for BL to just make it so we can set the speed to anything in between those values or even higher. Just something that would make BL printers better.
Thanks,
Will