I'd interpret it as "in order to" or 'that'/ чтобы/ para (Spanish) and similar thoughts. I'd love if you would.... or I'd love it if this were to happen/I'd love it if you could. Same with 'signal for'. I would signal for them to start something. = I'd would signal them, for them/so that they..... start something.

Thanks, Michael! I've just looked at your sources, they are quite revealing! Thanks!

"I'd love for you to ... " looks like US informal English to me, so I suppose you might use this when you are speaking or writing in an informal US English context. It looks "wrong" to me, although I see it a fair amount. It's probably not something to use in your Oxford English test :) "Signal for"; this looks OK to me. https://idioms.thefreedictionary.com/signal+for https://dictionary.cambridge.org/grammar/british-grammar/for https://forum.wordreference.com/threads/wed-love-for-you-to-visit-us.3210365/