Hmm. Not really what I'm looking for. I was thinking Cron (this is your currency, right?) is something like time=money concept. It could potentially become a good fit for social projects, communities, individual services.
The best way for you is to issue your additional coin, which will be backed by your services/goods/time.
You can easily start an exchange, and people will trade your coin to CRON/BTC/USD/EUR. For example, if you are a teacher and your lessons are good, your coin price will grow.
Other people will issue their coins and people will exchange one coin to other.
But there is no way to make one "universal" backed by time coin! Each person/company have to issue their own coin.