Wrote a JSFL, it can make the bitmap in library, if its compression is Photo(JPEG), toggle between use document default quality or custom quality, it also set “Allow smoothing” to true.
If you do not want to use “Allow smoothing”, comment JSFL line 16:
library.items[i].allowSmoothing = true;
Both function are the same, just because Flash CS4 interface changed again, the wordings are different. After downloaded, unzip to C:\Documents and Settings\<uesrname>\Local Settings\Application Data\Adobe\<Flash version>\en\Configuration\Commands\