Sorry, Jeronimo, I know the readme doesn't work for you but it's mentioned in the Readme, change logs...
Still you can find the change logs in the first post of this thread
Yep, it's a limitation that you can only have three /xhopon's toward the same contact in a row (and it takes about 9 seconds). Actually I'd say it's a limitation from Microsoft: .net messenger services seem to have a great anti- block/unblock flood.
Thanks for your concern