I'm evaluating software including Inkscape for creating vector graphics to be used in games, the vector data from the SVG files will be used in the game (either rendered at run-time or pre-rendered in memory as bitmap images when the game starts, but never pre-rendered as bitmap images to file). I don't really have any specific questions yet as I'm just getting to know the program and haven't read all the docs yet, but if anyone has any tips/tricks for this kind of activity I'd appreciate any pointers.

The sort of things I am concerned about are listed below. I am interested in these from both an artist's workflow point of view and a technical/tools point of view:

1) Document/objects centered at (0,0) rather than having (0,0) in the corner and/or exporting objects with an offset to center them about (0,0) in the numeric path data.

2) Optimisations:
a) Reducing path overlap to reduce both redundant data and render times.
b) Merging paths of the same colour into one path for single-pass rendering.
c) Exporting single-object path data only rather than manually editing it out of the SVG file after saving, and also reducing the amount of human-readable data leaving only the raw data needed for rendering.

3) Designing rendering-efficient images

I will probably be using AGG (http://antigrain.com) for the rendering.