Well it's already pretty easy to deploy with a few clicks ... how many are you planning on deploying? I guess if you really wanted to, you could try to write something using PowerCLI or vSphere SDK for Perl, you can look into import vApp via .ovf and with vMA, there is a direct link from VMware at: http://www.vmware.com/support/developer/vima/index.html
From the release notes it's not a good idea to clone vMA ... and it probably won't work if you try to clone it but you could try and see if you can turn it into a template and then deploy and try to customize the image using vCenter. These are probably the ways I can think of in terms of automating a deployment of vMA, if it even works.
VMware vExpert 2009
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