One suggestion for a feature enhancement: move the caption inside the anchor tag (i.e., the link) so the caption is also clickable as well as the picture. This is especially important on mobile devices, where the smaller screen size means that the caption can take up a lot of the slide area, making it difficult for users to click the photo for the link.
And on a related request, it would be nice to be able to add HTML code to the captions. For example, if I want to add a link in the caption that tells users to "click here" or "read more," it would be nice to be able to add an anchor tag. I tried doing it last night and the tag got split in half, with second half of the tag showing up at the top of the screen.