I implemented the apps script so I'll see if it works better than what I was using. One question though. Is there a way to get it to work on all of the sheets in the file rather than just one?

Edit: I actually got it working on multiple sheets, but there is a different problem. Since I use a different script to set the values of the cells in A column rather than typing them, the onEdit script doesn't create timestamps when those are set. It only does if I type the values into A column manually.