Suggestion.

Right now half-press of camera button focuses the camera, and full-press saves the image (I rarely need saving the image from mbarcode, and the button on the right side of the touchscreen is quite enough).

I would prefer to have full-press scanning the image for barcode, because I suppose that scanning the camera image every millisecond for barcode spends the battery and uses too much CPU.

MBarcode can take 15.9%-17.6%-18.2% of CPU when lens is closed (what are there 50-60-70 fps doing here?), about 50% CPU when scanning, about 5% CPU when on results page. In the first and third case it should be doing exactly nothing; and in the second case I would prefer to tell it manually when to scan the barcode, not to have it automatically trying and trying and trying all the while I haven't put the camera in the best position to see the barcode yet.

I have already turned off automatic focus in the options because I didn't like the sound of moving parts in the camera (it would wear away if barcodes were scanned frequently with automatic focus). Now I would be thankful if you made the option to turn off auto-scanning and make it manual.