I will implement export to any format that will be in demand. I have configured UserVoice page, please check it out http://manager.uservoice.com/forums/202564-plugin-ideas

Make sure you mention this on your website.

I'd also suggest you create a bitbucket account for issue submission since:

1. You can enable access only to issue tickets 2. you can keep your source code private 3. it's got a low barrier to entry (you don't actually need to keep source code there, but git is awesome and so is bitbucket)

Definitely the export list is a barrier to adoption. Really, it's all I care about.

I'm sure that any small business package is going to have a chart of accounts, invoice creation, etc. What I have to make sure of is that my accountant can import the package's exports and do my taxes. :)