The forums are littered with attempts to do such things, the issue being that the forums are notoriously tricky to navigate once something gets buried in the bulk... and then there are the issues of a simple system change requiring a full rewrite of macros in some cases making things quickly out of date. All of that being said, the wiki has sections for system specific guides which can be updated by the community to showcase common macros and solutions to mechanics issues :) Seems like a good place to start and the wiki can always use new, dedicated, contributors...