TGA batch output

Hello!
There is a plugin that exports each layer as a single TGA. But sadly there is no alpha channel anymore after exporting.

I'm looking for a plugin that does the same thing + keeping the alpha channel.
And it would be great if that plugin was able to name the new files that way: filename_0001, filname_0002 and so on.
and even better if I was able to select the destination folder.

Is there someone out there who is able to rewrite the script a little and help me? I'm not able to something like that. :-(

All the best and thanks!

ps There is also a script_fu thing out there called continous_save that can't do tga and doesn't seem to work with gimp 2.6 at all.

Kris