Hi,
Glad you find the app useful!
Color coding by 3rd variable: this isn't possible at the moment, unless your seriesField is the 3rd variable you mention. Perhaps this is what you want anyway, though. You could put your current seriesField in the extras so it's still visible in the tooltip. Otherwise, we'd have to have two legends and I think it would get confusing.
Passing variables: yes, you need the token_safe stuff. Where are you trying to do this that it doesn't work?
Extras: the extras field is supposed to be in JSON format, perhaps the format is incorrect? Escaping all the stuff is a mess in the XML, I recommend you make a macro out of your search and use that in the XML, it will simplify things quite a bit.
Max width for legend: no, there isn't at the moment, but I can work on that. Anyway, I would recommend cutting down on the number of series, otherwise the chart becomes a bit of a color soup and it's probably less readable.
Cheers,
Alex
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