I use Whirligig. Only one I've found that works for SBS or OU .jpg. Set stretch to 0 or 50 for full SBS or half SBS. Still nothing for .mpo files though, so they have to be converted to L & R images and manually combined as one SBS.. The settings for a type of image can be saved as a preset and applied to others of that type. After that the settings are remembered for each image. Use the right joystick for advancing through a folder or manipulating the timeline of a vid.
i7-5820K @ 4.2Ghz, water cooled, Asus X99-Pro USB 3.1, 48 Gb DDR4 2400, Samsung 950 pro M.2 SSD, GTX 980 Ti SC, 750w psu