well I know in datapump you can have wildcards, but when you then open those projects directly in Monarch, you have to select the reports manually - monarch itself won't process wildcards.
Personally I would look at using the API to do this (see my post in the VB thread for an example of what I mean).
Using the api methods..
you would start monarch
set any runtime parameters you may have
have a loop to set the reports (there is an append flag)
set the model to use
Alternatively you could have a project set to look at a dummy report (titles only), then after loading this project in monarch, use the set report functionality to add the real reports (as above)
I think for what you seem to want to do, your batch file will possibly/probably end up being much more complex than a vbscript would be.