Right now, the find mode only highlights one particle type with red.
It just so happens that the cursor to select the element to find (left click as primary cursor) highlights the element red.
So using this logic, I think it would be quite handy to use right click on an element in the menu to highlight it blue, alongside whatever red particles you want to focus on, and thus this logic can also be extended to middle click to show a 3rd element as green.
If blue is too dark on the black background, perhaps it could use cyan instead.
Personally I'd love to use a couple extra "find" selections to view up to 3 specific elements on my infinite fusion chamber. Many elements that can be observed and studied within one of those, and I'm sure many other people could find multiple finds to be very useful for a plethora of reasons. c: