Global expression combines multiple regexps using an AND operator, while in some cases ability to use OR would be required too.

For example I use a "white list" (like - "good1|good2|goodNNN...") in the global expression and it's really long, so does not fit to the 255 chars limitation.
I could split the list to several parts and put them to separate lines to workaround the 255 chars limit, but it's not a solution because I need OR between them, which is not possible currently.

Maybe the same approach, as used for actions and lld rule filters (including custom expression), could be implemented ?