I will step lightly here as I have never used the Action Illustrated designer.
1. We are working on a module that will let you add any art to your design base but that is about 4 to 6 weeks out in development time.
2. Just to clarify the Desing Base itself is free, you do not have to pay for it. Version 1.2 can be downloaded for free and works with X3 thru X6 currently. I did this so we could develop it step by step and keep improving its functionality while offering free downloads of the upgrades.
We did have a few users with issues on the last release, that I know of 5 users with problems but those things should be cleared up within a week or less. But when you are developing for Windows XP thru Windows 7 and CorelDRAW X3 thru CorelDRAW X6 at the same time you are bound to hit some issues.
From what I have seen Action Illustrateds art looks amazing to say the least. They seem to have a comprehensive library per my review of their websites.