Gary,
F25s are fun to own, even if you just use it to get the mail.
A rolling merge is close to what you want, but has one tiny hiccup; Any layers created today are considered part of the "recent" tier (even if most recent is set to 0) and are never merged.
To get what you're asking for, create a simple Merge action instead of a Rolling Merge action. Set the merge criteria to
From: 0 layers after first layer
Through: 0 layers before last layer
That action will merge every layer in the archive into a single layer. Schedule it run immediate after your daily capture.
I'm glad you enjoy the app.