Many times, I copy code and use it on another sprite in my project. In a text based coder, I would use find/replace. At the moment in Construct2, I have to double click in to each event to change the sprite. Here's my suggestion to make that much faster.
I don't know if this or another method exists already. If it does, I'd love to hear about it!
<img src="https://dl.dropbox.com/u/10196246/ChangeSprite.jpg" border="0" />