as far as I know (never used it) you can do this with custom Build steps (Press F1 for Help and go to "TheIDE help"->"Congfiguring Packages and Assemblies"->"Custom Build Steps"
right click in the upper part and choose "Append Row", give it a name and tell it the extension (.asm, i guess).
In the next part enter the command you want to be run (have a look at the screenshot in the Help)
at last tell TheIDE which files will be created by that build step.
I don't know wether you have to add something to your package configuration so TheIde will use your output.
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