Custom config files(xml) not transformed with Slowcheetah Extension when publishing for Azure Web Role

Question

I'm searching if SlowCheetah is available for Azure Web Role.

・Visual Studio 2012 ・Azure SDK 2.6

When I create package(.cspkg), I found that web.config is transformed by each build settings but other custom config files are not transformed.

I have two build settings, "pre" and "pro" . (test.config, test.pre.config, test.pro.config)

I'm trying to make a package with the pre build setting, but the output file in cspkg remains unchanged.

My questions are the following..

1. Can I use SlowCheetah to transform custom xml files for Azure Web Role?

2. If the first answer is no, are there any alternative ways?