Combine Animation Composer with own expressions

Hi everyone, I'm making this animation with AC and its animations are great for the thing I'm making, but I also need objects to keep moving slowly. so far I've dealt with this using keyframes, setting them before and after the AC transitions, so AC can pick up the movement smoothly. this solution works fine, but it's a bit cumbersome when i need to apply this to a lot of objects that are on the background anyway.

so I started wondering if I can add a wiggle and--
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Oh wait, i might as well try to see if it works before posting... 
WOW IT ACTUALLY WORKS!
I just added it like this:

result = getAnimationComposerPresetValue()+wiggle(3,30);

also, I saw that in some cases, you need to correct the position or rotation by dragging the values in the timeline.

I was about to close this post, but I decided to finish it, in case someone finds it useful