Thanks for your effort. You've already covered some ground in the examples, at this stage you're trying to fire up network effects and attract users/analysts/developers.
Treating this like an optimization problem, it seems that there's more potential for attracting users if you broaden the scope of vignettes and let Duckduckgo/Bing/Google do its magic for queries like 'optimum scheduling in R' or 'cutting stock in R' etc etc.