

learning to use a workshop has nothing to do with how the tools are constructed. open source means very little to people who are not familiar with software tools, and is not likely to get someone started.
as soon as you are even starting on an intermediate level you need to care a lot, because you start building your own tools. but before that point, open source just means the big players. good luck explaining the benefits of awk
before they know the difference between office and openoffice.
sounds something like call of cthulhu rules.
personally i think xp is too fiddly. i prefer systems like fate where you can just rewrite skills to fit your style of play better.