Groups - Ability to add number of participants by date instead of by group

We have regular groups that visit every week. Instead of adding the same group as multiple entries, it would be helpful to be able to add the total volunteers committed to the "Group Hours Worked" by date for proper calculations. The same group may have 8 participants one week and 11 another. In cases of repeat groups, this change is paramount. When a report is then created, the number of recorded hours would be multiplied by the number of "Total Volunteers Committed," on that specific date of entry, rather than by the static definition on the Group Details.