More granular review scheduling

When learning new vocabulary, I would find it useful to have the first review earlier than the next day, maybe just after one hour. Having a shorter review interval, apart from helping me learn better, would also be beneficial as it would stop me from accumulating a huge backlog for the next day on days that I am really busy.

Unfortunately, It seems that the review granularity is only by the day, even for 25 %. I don’t need higher granularity for the higher percentages, but for the first review it should be possible to choose a fraction of a day, maybe by the hour.