Perhaps, but I've yet to see evidence of needing any level of sophistication beyond "move the mouse" just to show you're online and in most companies that's even overkill as 15 minute breaks are typically not an issue. If they are, time to look elsewhere.

I created my program because I had a ruthless boss at the time, but I don't think any spying was ever going on. I use it now out of convenience when I take extended breaks and peace of mind from potential jealous co-workers complaining I'm not online when I should be or something stupid along those lines.