I did a brief search. Sorry if I missed something obvious.

Usually, I clean up my illustrations with the XML-editor. Often to get straight angles or same length sides and whatnot. It used to be fairly straightforward, but lately, the coordinates have been given in a relative fashion. As I process the coordinates one at the time, the image gets all jumbled up. It is also very hard to calculate the coordinates by hand.

Is there a way to shift between the two annotations absolute and relative? I'm an absolute kind of guy.

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I'm not sure what kinds of primitives your are working with, but many of the path commands can be changed from relative to absolute by changing them from lower-case to upper-case: http://www.w3.org/TR/SVG/paths.html... this would allow you to edit in absolute or relative. I can't test any ideas about getting inkscape to output one or the other right now: combining and breaking apart, or grouping and ungrouping... if none of those kinds of things work, it may require an extension to output SVG with absolute rather than relative paths.