Putty Command Sender: http://www.millardsoftware.com/puttycs
Sends keystrokes to putty windows. Filters allow selection of putty sessions/windows to which the commands are sent. You can exclude/include and use wildcards in the filter. I don't think it supports regular expressions other than * and ? Allows arrow keys, control characters, and a lot more.
Be real careful when using this, experiment first on lab systems.