Yes you can.
Starting in Version 2.5, in Motion Explorer, you can select multiple recordings to amplify all at once.
On your tree-view list inside a collection, you will see the videos listed. Any video with a green check has been amplified. Any video with a yellow caution symbol needs to be amplified.
From within a collection, use the "SHIFT+Click" or "CTRL+Click" to select multiple recordings. After the necessary recordings are selected, click on the "Amplify Recording" icon from the ribbon bar. Note - the icon will also only appear active when a recording which needs to be amplified is selected.
The attached recording gives a short demonstration of this behavior.