your powerbook will support classic mode.. classic is emulation of OS9
what it may not do, is boot into OS9 rather than emulate it
this causes only a few problems, as most apps are OSX native now, but a few like certain norton utilities and Playstation emulators need to boot up in OS9 to work properly - Apple stopped allowing more modern machines to boot into OS9 by doing something to the firmware
have a look around for an OSX starcraft patch, even a third party one
http://www.versiontracker.com usually has decent mac shareware/freeware