I've made many friends while playing this game but I can only talk with them while i'm online. a pm system would be awesome for organizing matches between friends

yes, i think being able to send chat messages to a person's profile would be a great idea

totally!

I think the reason private chat out of games is not allowed is cause they will be used in games with no private chat to form alliances.How ever you could make a game with your friends don"t start it and organise the matches and settings there and you can delete it later or start it.

Vote here: https://warlight.uservoice.com/forums/77051-warlight-features/suggestions/1071171-global-private-messages