If I have a computer online and logged on I should be able to wake up other computers using that. Might involve keeping track of MAC addresses. Currently I'm doing this manually by bringing up a remote terminal and running mc-wol.
We already have a similar feature in our wishlist: it will be possible to use the Wake on LAN feature, provided that there is another Host online in the same LAN and it is online, i.e. the connection will be established through the second Host. We will implement this feature in our future updates, but, unfortunately, we cannot provide any specific ETA on it yet.