The support for Accounts sync is in development pipeline. We will get it implemented in our next release. I will keep you updated when it is available.
The Invoice and Quotes are related to both the Contact & Product. So, to sync Invoice or Quotes, the Contacts & Products need to be bidirectionally synced to keep both application updated. This will help you get the line item when you sync Invoice or Quotes.
Now, we do not have option to setup rules, please do write to us at support[at]smackcoders[dot]com. We will help you!
The license key is generation is automated. I will check with Jason and keep you updated. If you need any technical help, please do feel free to email us at support[at]smackcoders[dot]com.
