I've been a user of animation master for nearly 5 years. Its a nice program and there is a plugin to help get animated models, with textures, into Gamestudio. Maybe someone here would like to look into it, maybe not but here's the link.
i looked into A:M some time ago and was quite impressed. the only thing that kept me from buying it was the (once?) halfway broken and old *.x exporter. so where is the plugin you are speaking of? the only emilio-post i found dealt with manually saving all frames -.-