I ran into the same problem. Here's what I did. First, get the free and very handy
Dropbox (if you download Dropbox from that link, we both get an extra 250MB of storage). Then use your favorite Image editing tool (I used
SnagIt - not free but very handy) to create an image of your PCa History. Then, just copy the image to your Public Dropbox folder, right click to "Copy Public Link", then paste that URL to your signature profile. If anything in my history changes, I merely replace my image in my Public folder and everything gets updated.
Make sense?
...Jerry