Here’s how to wiggle only one dimension:
https://www.motionscript.com/design-guide/wiggle-1-dimension.html
Or if you want separate wiggles for the x and y, Dan’s expression would look something like this:
wx = wiggle(2,50);
wy = wiggle(2,10);
[wx[0],wy[1]]
Add a slider to start/stop/completely control the amount of wiggle. Here’s how:
https://forums.creativecow.net/readpost/227/8953
I really like a preset named Quaker for earthquakes/camera shake. It uses motion tile to fill up the edges, and comes with slider for freq and amp:
https://scottfrizzle.com/free.html
The pdf explains preset install, drop quaker.ffx in your presets folder.