There should be a feature to update the price on amazon listings when we change the price on linnworks not only manually but also when we change it via data import tool.

This should be for all available channels not just Amazon. (eBay & Magento as well)

I agree, we should be able to update the channel pricing fields by import as we can with extended properties and set a price in the file per Amazon, eBay & Magento. Autonomous Synchronization should take care of the rest.