Just a much easier and faster method for swapping crusaders.

Instead of clicking the double arrow, then finding a crusader(if multiple) to swap, place a small thumbnail of each hero to replace the swap button. This can allow you to click on the thumbnail of crusader, and swap out the current crusader. Also if you hover over the thumbnail of the crusader, you can allow a tool-tip for more info on the crusader(equips, enhancements, exp). Exactly like how you have the talents for the crusaders.

Didn't see anything on links, apologize if breaking some rule. In this image it shows the characters and idea, but I'm sure you developers can find a better way to spice it up, or fit in the crusaders current box lol.
http://imgur.com/DbmfVPT