They've stated that they consider themselves a competitor to paypal so i can only imagine that eventually they will start to offer services like this in the future. They are only just getting started.

WePay lets you collect money (people can pay you with credit card or bank account) and then you can send money that you've collected to whoever you want. So you could, if you wanted, put money in your group and then send it easily to whoever.

Yes. If they are part of your "group", then you can transfer money back and forth. It takes an extra step, but it's definitely possible.