Can you scan a document directly, instead of an overview scan first?
You may be able to configure the scanner so that pressing the button on the console automatically sends the image data to a folder on your computer, without going through Image Capture.  

Another option, since you asked about third-party apps, is Vue Scan which is well-supported, and can scan without first doing a preview.

(edit to add) yet another third-party app would be Paperless, which while technically is more of an archiving solution, it also will scan directly to its library without a preview.