Not really a bug... i'm using a lot of swf files, and they're completely crowded with actionscript code, on the main timeline and inside some nested movie clips... but it seems to me that, setting resolume to control the timeline, actionscript is not ignored at all, it works fine anyway I switch: resolumetimeline or flashtimeline (the same in 2.3).
Am I missing the point of this feature?
Anyway thanks again, amazing job you've done, even 2 layer flash playback works faster. I wish you could make the .swf alpha channel work properly but I understand it's not on you