My recommendation, let’s keep CS-Cart simple. Is it starting to get bloated? 1000’s of orders here and not a single complaint at checkout with version 1.3.3. Complicated features bring complicated results. Do we really need Ajax at checkout? Seems like lot’s of CS-cart users using 1.3.5 are having customer / browser issues at checkout. Let’s get 1.3.5 straightened out and leave it.
I’m still using 1.3.2 and it works great, no problems at all…