Congratulations for the software, It's so much easier to use than the other softwares in ubuntu and has a lot of more funcionalities. I like it a lot.
On the other hand, I noted that the pdf generated in gscan2pdf are a lot larger than simple-scan. The same document that occupies 1.7mb in gray-scale with 150dpi in simple-scan, in gscan2pdf, with the same resolution, occupies 5.5mb (that is a media using all the compression options). I know that that is a jpg quality option that can decrease even more the size file, but than the document becomes useless.
Am I the only one noting that?