Custom Import Export Plugin or Script

I’m loving this latest version and all the support from the community here. But in all honesty I am having a real issue that I have to be able to resolve.

I have posted a few other posts about custom fields and db structure, Richard and Mark have suggested an array for custom fields.

So is there anyone else beside me that needs a custom import export of listing data that can also import the custom field data?

Has anyone written this?

or better question can anyone here write this?