how can I tell the Authors
You can post a thread on the forums... oh, you did.
There is a poll to help me guide the development of ERA (
http://www.ironcrown.com/ICEforums/index.php?topic=17925.0).
I use the poll to get an idea of the most popular requirements. AFAIK the few people who wanted to use it for SM so far have created their own custom configuration files, so no one asked for a dataset before.
I'm quite certain it could be done. But it wouldn't be a small task.
I have never played SM but I have checked some of the books at one point or another. I seem to recall there are "psions" that are equivalent to spell lists, and more Armor Types beyond the 1-20 in RM.
Another complication would be the quality of the books. You are asking for SM2, which I understand is older than the latest SM books, so quite likely we would only have low quality scans, and that is a complication when creating large datasets.
If we can confirm there are enough people interested, we can look into it.