I guess all my whining about needing more integrations finally paid off... because cs-cart just answered this to me in their blog:
Some developer guides on API usage are to be published later. We really want to make CS-Cart more open for the developers, and providing a reliable API is essential.
One again, thanks for caring, it is very important for us
Finally we will be able to easily hook up 3rd party apps, like accounting, crm, and so on! Also the new admin simply looks fantastic. I am very happy I didn't make the switch to Magento when I was considering this some months ago (only reason: the need for better integration with other software).