Yes, I see, it doesn't seem to bee a big Jaikoz problem, and there are ways to work around it with Jaikoz. None of them is very easy (especially having to delete metadata to force Jaikoz matching via AcousticID, while you could easily add a function for that is... well, thank you), but it may work, but i won't try. Jaikoz is not and will not be the right tool for that, I understand.  

I understand the complexity problem. But Jaikoz is already full of different options that need a lot of fine tuning for many users and far away from "one-click-easy-to-use" software, so the decision is already made - it is a power user tool and nothing for beginners.  

I imagine dialog boxes with different choices like in "match all songs to one album" where the user can choose which metadata should be applied to one song, exactly when Jaikoz needs this information in the matching process. So when Jaikoz thinks that there are 10 matches to one song, it presents me with the options, and with the click of ONE button (so there has to be one button for each possible match, no radio boxes or similar because it needs more clicks) it takes this metadata and continues with the process and asks me again when there is the next multiple match.  

OK, seeing the logical break with not being editable. I think this is self-explanatory and users don't need to be "protected" from confusion, but this is your decision. I would welcome the length column too.  

OK, seeing the logical break with not being editable. I think this is self-explanatory and users don't need to be "protected" from confusion, but this is your decision. I would welcome the length column too.  

Yes, I know they are there. So technically, it is no problem to show them. But I would appreciate to have also checkboxes in the columns, not only the tabs. Because only relevant information is if ID is present or not. The ID string takes far more screen space and has almost no additional use in column view except telling me "present" or "not present". In some very seldom cases, when you really need to compare the strings manually or copy/paste them, you would have the option to show the strings, still. Just let the user choose which display option he likes by making it possible to show/hide the columns as it already is with all the columns.  

So, the "Show View" option is "Original Value View"? Maybe you should rename it... but the problem persists: I cannot compare original and new values of more than one file simultaneously and I have to click-click-click.  

And why would I have to scroll horizontally?  

It would also be possible to expand one file to two rows - first row original values, second row new values - could be colored differently to support the user.  

Different solution (I think easier to code, but not so powerful) would be letting the user choose, which values and in which order the Changes tab displays.  

Of course I can use the scrollbar. But same problem: one click moves down one pixel. Should do at least a row (three I think would be optimal). Only dragging the slider or clicking the bar, not the buttons, is acceptable fast. But not very exact. I think, if you can fix the scrolling speed of clicking the up/down button, my mousewheel problem will also be solved. Please keep in mind: Even if you don't use a standardized feature, many users will and expect the UI behaviour as they are used to it from other programs. Mouse wheel was a great invention that makes scrolling in multi-page documents or spreadsheets a lot more comfortable. It is a bit like having touch controls (inverted if you are not on Mac OS X Lion and above, but similar), and you don't want to tell me, that touch controls (dragging webpages on an iPad etc.) aren't an easy and comprehensive way of navigating.  

Again: my proposal is to have one additional column with a box I can uncheck for each file I don't want to save. This could also be combined with the "Status" column with the floppy symbol. In case I click it, it changes to a closed padlock or something, or the file row gets greyed out, and when saving the files, those files stay untouched.