As a Roblox group owner, it can be hard to remember why certain group payments were sent to group members. My suggestion is to have the ability to add an optional note to payouts that can state why the payout was made. When you payout group members, there would be an optional note feature that you can turn on. A box would appear where you can type a short message to the payout that can be viewed in the group logs.
If Roblox is able to address this issue, it would improve my experience because I would be able to save more information about payouts in my group.