Are you using the camera self-timer to trigger the shutter button? If not, do so as it will help prevent blur from camera shake. You still have to press the shutter button halfway to lock focus.
Also, your camera has image stabilization. You should shut it off when using a tripod.
Yes, macro mode could work but check the camera specifications in the manual to find out the close focus limit.
btw, a scan shouldn't take that long. You may have settings wrong; you should be able to adjust resolution and file size and dimensions. My husband and I scanned 40 years of family photos and made a CD. While it is time consuming (and well worth it), it only took about a minute to scan each photo.
Let us know if you have other questions.
Related reading - using the self-timer:http://www.digicamhelp.com/camera-features/camera-parts/self-timer.php