Hi Gopal,
Thanks for the suggestions. Let me comment them one by one.
1. The numbering, and also previous, next, play and stop buttons (is short: pagination) is something that you can vote for right now in the poll you can find on the front page. So it's something that I'm already thinking about to implement in a next version.
2. This is more complicated. In the site you link to, the captions are places under the images, my guess is it's a javascript slideshow. So the adjustment of the caption placement is automatic. It follows the height of the images. My slideshow is a flash object. It has a fixed size. You might make the background transparent, and not use a border, and then it might be useful to have the caption placement follow the image height. But otherwise it wouldn't work. I'll have to think about this, but I'm not convinced of its usefulness. For now, you'll have to edit your images so they combine well together in a slideshow.
3. I already commented the placement of the captions at point 2. The length of the captions in my slideshow is not limited. You can make them as long as you want. Unless you write so much there's no more space in the slideshow window of course
If the caption doesn't show up entirely, try setting a 'text bottom margin' for the caption.
4. You can write day, time and date in the caption… Just kidding! I'll have to think about this one. Why would you want to show this? What day, time and date would that be? Something you'd want to set for each slide?
It might be nice to be able to use some text markup in the caption (like bold, different colors, etc). No idea if that is possible. I'll have to look into it. If it can be done, I might add it to the poll.