Define field (custom) CSS class/id?

Dear plugin author,

I’m looking for a way to add a custom CSS class/id to any given field.
I can see a lot of field “style” options, but sadly noone to add a CSS class/id.
Is this somehow possible ?

Use case is that I want to make a third party javascript script, that will listen for a combination of certain field classes being clicked and do something very custom – could be to show some complex sort of slideshow connected with custom backend fields.
– with other words, something that wouldn’t be possibly convinient or wishfull to setup through your conditions setup.