Keeping the keyboard/mouse active

I hope I don't come off sounding like someone that wants to bypass group policies... I know it will sound like that, so I will explain.

I am systems professional with really good ethics!!

The laptop I travel with is owned by the company and we use smartcards for access. The system is locked down so we can't install on it and have no admin rights. That keeps the company's computers standard. It works well!

We carry thumb drives with our portable apps and there is no company policy to turn off the USB and they encourage us to use it so they don't have to modify individual computer laptops for a program they don't have in their standard load.

Here's my problem:
Their screensaver kicks in every 15 minutes. We have to log back in with the smartcard. This is a royal pain. I am not always sitting in front of my computer while I am working. I walk over to servers and work on them, waiting for email to come in, talk too long on the phone without clicking my mouse, etc.

Does anyone know of a portableapp that can initiate a mouse click or something, even if it is only every 14 minutes? I know it might be considered malware or spyware, because it might need to monitor usage. But if it is a tool that we can turn on as we walk away, it wouldn't be running on it's own. Activated by the user only?

Comments anyone? ;-/