Update Let me rephrase this a bit to address the comment below about "significant value" being subjective. The motivation to add extra questions should come from wanting to add more value and not from wanting to improve statistics. I did not mean to say that such posts should be judged based on some perceived value (votes do that anyway, to some extent). The site is already more active than typical.
When sites can graduate doesn't depend on any current statistic but growth. See this very informative answer:
I'd say, only ask a question that you can solve if it adds significant value to the site. Please don't add questions for questions' sake, but adding really good questions that are likely to be useful for many people can be nice. Let's keep the quality high.
We talked about perhaps asking nicely formulated questions to which some of the valuable tool-bag posts could be answers (because the tool bag post is not really something that should be moved over here as is, but some of the better tips there deserve their own post).
And don't forget: this site is already doing pretty well in question numbers compared to other betas. Several of the graduated sites don't have 15 questions per day either.
Finally, another question: Is it okay to ask a question which I think I could solve, but it'd take me a lot of time, I need the solution for my work, and I expect that someone here might already have experience with it?