Change session timeout length

This is a great tool, but I'm having a problem. When I am updating files using the ftp feature and leave for a couple of minutes, then come back, I am not able to open up new files. The session seems to have timed out. If I get into the root folder again and maneuver back to where I was working, I can start again, but this is a pain. Can I increase this timeout setting? Can't seem to find it anywhere. Any help would be appreciated.

FTP timeout is server bussiness, not a client bussiness.
PSPad offers you possibility to send command(s) to keep your connection alive. But it depends of FTP server