If you want to do something in the future, we would allow you. If you wanted help with English for the next year, I would give you it. "Do you want to?" Yes I do- If you wanted to (if it was something you would like to do) you could, or we would for you etc Does that help?

条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表示的是假设的或实际可能性不大的情况，故采用虚拟语气。 其他， 在表示虚假的、与事实相反的或难以实现的情况时，用虚拟语气，表示主观愿望或表示某种强烈情感时，也用虚拟语气。

I think it means "if you want to" now or in the future. It really is a way to say "If you want to". The speaker just has an odd way of expressing himself.

It is an offer. It suggests that their is nothing hindering a persons desires (in this case, of friendship.) If the desire exists, let it be the case in the future.

"If you wanted to hang out" is a very common phrase, kind of meaning, "If you could have been able to hang out" but with less words. English often tries to simplify sentences by using less words. A wordy sentence distracts the reader and listener more than a simpler one, but a balanced mix can be good too.