I just recently got the Cintiq 22hd and was crazy excited to use it on zbrush but I don’t know how to set up zooming on the zoom strip. This is my first time with a tablet but I’m guessing I have to set up the hot key and I don’t know how to change it to the weird Alt lmb let go and move mouse…how on earth would i do that? I know WHERE to change it but it wont even let me add alt at the beginning. Can someone help me please? Thanks.
ctrl+rmb does the same thing 
How do I apply that to the tablet though?
you assign the rmb to a key on your pen and hold down the button you assigned to ctrl. You can’t use the strip for zooming if I recall correctly. I have it set up for brush size
I like to setup my pen to use right click and middle click. Then in Zbrush make sure “Preferences>Interface>RightClick Navigation” is turned on and “Preferences>Interface>Enable RightClick Popup” is turned off. I find it easier to use the pen to zoom as it’s also used to rotate. It starts to feel more natural and zooming and rotating become second nature without any thinking while modeling. 