What do you mean there is no earthquake? Haven't any of you guys played GAE (Glest Advanced Engine - A modified, up to date Glest with bonus features)? One of the units (sorcoress or something - a magic unit) has an earthquake attack. While the attack is no perfect, it randomly damages units, and is pretty interesting in looks. Download GAE at glest.codemonger.org and check out the unit (its not made until later, play as magic and keep going until you unlock the subfaction).
As for XMLs, I am actually secretly attempting to develope a XML maker, which will make the resources, units, and stuffs XMLs and folder layout. However, you will still have to add the models yourself, though detailed instructions will be given. BTW: I will be posting a topic about this in Gen Discussion soon, as soon as I get a discussion page on glest.110mb.com up. It is still in the planning stage, and is an ONLINE PHP POWERED WIZARD. I can't program well enough to make a desktop app, so it must be a PHP powered site. However, I don't expect to be finished before the summer...