Scanning, Faxing & Copying

I'm having a problem scanning 11x17 paper with the OfficeJet Pro 7740. I'm trying to do something like, and having the same problem as in a couple of other posts (HP 7740 scans 11x17 page as 17x8.5 and 11X17 scan cut off). In both of those cases, the solution from HP was to use A3 instead of 11x17. Ignoring the fact that this isn't a solution but a work-around, it doesn't work for my case. The document I'm scanning is a schematic with information right up to the edge of the paper. A3 paper is wider and shorter than 11x17 (tabloid), so I end up with an image with white space on the bottom and the left side cut off. Then when I try to print it, it is even more messed up because now it either has to be scaled to 11x17 (which makes it too small to read because of the white space), or use "actual size" where the top now gets cut off as well. Plus (and this is more an annoyance than anything) I can't just let the printer select the right paper because the document is A3. 

Now for the second bug: When I do try to scan it using 11x17, I get the same thing as in the aforementioned posts (it tries to output 8.5x17 instead). If I try to modify the scan in the "Manage Images" tab, I see that the settings are correct, but the output is still wrong. But if I try to manually change the width (click on the box and then hit backspace, don't just highlight it and hit backspace) I end up in an inescapable loop where a message tells me "You must enter a number between 1.00 and 8.50 for Width", but when I try to exit the message, it sees that the width is still 11 and pops up with the message again (see the image below) until I finally force-quit the program.

These are clearly bugs, one of which breaks the program, so I hope that HP sees this and fixes the bugs which have obviously existed for two years now (based on the dates of the other posts). They were extremely responsive last time we found a bug, so lets hope they continue to impress me!