Looks like an excellent start, and definitely fills a needed niche under OS X. As far as feature feedback, and perhaps for 2.0, one possible addition you could consider for your idle detection or tracking capabilities would be Bluetooth device reads. When I leave my system I take my phone, so in turn that can act as a useful automatic proxy for whether I'm in the area so to speak or not. I use that already to automatically do things like change my away status on IRC or activate the screensaver if I've forgotten and change display timeout. It's a niche nicety and not really necessary but might be worth considering. Alternatively if Qbserve was AppleScript-able enough that could just be handled via scripting same as anything else.
As far as marketing if you decide you'd like to just get it in front of a lot of possible seats you might consider picking one or more of the application bundles, particularly "productivity" focused ones, and see about getting it in there. You won't make much money on it directly, but it is a good way to get a lot of people who wouldn't necessarily risk it otherwise to give it a spin without actually giving it away for free, and in turn sell paid upgrades from there. I wouldn't necessarily suggest doing that vs pure organic, at least not for a while, and how much economic sense that'll make for you depends on existing sales and what sort of major upgrade schedule you're considering. It's an option to consider though and can be one of the better forms of advertising, in that it goes right to a naturally more targeted, self-selected audience for low outlay. Qbserve certainly looks plenty quality enough to fit in. Best of luck to you!
Edit to add: While you specifically contrast this to business software for controlling employees, nevertheless I think a number of small businesses in particular might find this interesting, more from the employee empowerment/knowledge point of view rather then control. To that end some form of basic multiseat discounts might earn you some more bulk orders (doesn't even have to be much, 5% off 5-10, 12% off 10-50, etc, or whatever makes sense to you). Similarly, things like Educational/Non-profit discounts and Family seats are tried and true ways to get people on the train.
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Also a small bit of extra kudos postscript: thank you so much for going to the trouble to actually choose a distinct, unique non-word name for your software. The trend of picking single standard words for application names (acknowledging that modern Apple is the originator of evil here) has been incredibly irritating as it makes searching and discussion entirely unnecessarily more difficult.