All I play on is a laptop these days (mobile MTW/RTW, wohoo!) and as far as I know there is no zoom in/zoom out.
You can drop down to the group with the keypad * key (Fn-P on my keyboard, but yours may be different). The camera goes up in the air with keypad / (Fn-0). Camera tilt is keypad ; for down (Fn-;) and keypad + (Fn-/).
A pain to use, but far better than nothing, and eventually you get used to it.
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