My gut tells me to work on the features that alleviates the bigger hair on fire problem for the customer. Usually, startups have less pressing needs for security than large enterprises, but I can actually see how your tech opens up a lot of startups to build quickly in that very lucrative healthcare space that is being thrown up in the air because of the Affordable care act.

You should aim to build only enough to close a sale. IF you build the in-browser features will that ACTUALLY close them? And that calculus should include this: Will it close enough SMBs that it counteracts doing a single integration with an existing system that will close 1 big customer.