We're using JSDB at the moment for JSBuilder3, and its underlying stream reader doesn't do encoding detection or conversion automatically; and by that I mean it can't do it at all, period. I fear that if your input files contain unicode characters, I doubt they will remain in tact in the target output (sch-all.js) file given the output file will not have the proper BOM. A simple "Save As..." with a specified encoding in any modern editor ought to resolve that, if you run into that issue.
I'll throw up a message on here when 1.2.2 is out, and you can let me know how you fare. Thanks.
P.S. we'll run a few unicode tests here. what might end up happening is we will force a UTF-8 BOM on the output.