In CodeWarrior Power Architecture version 8.8 release, there is included a Flash ToolKit that will allow you to modify/create your own flash programmer algorithms .elf files that you can use in the CodeWarrior Flash Programmer.
It contains a template project, documentation and examples on how to add a new flash device to flash programmer, in CodeWarrior PA V8.8 installation folder\PowerPC_EABI_Tools\FlashProgrammer. Please follow the steps described in Application Note AN3390: Adding Device(s) to the Flash Programmer and AN3630 Creating a Flash Algorithm for an Unsupported Flash Memory Device. Also AN2980 : Troubleshooting the Flash Programmer might be useful. These application notes are located in CodeWarrior PA V8.8\PowerPC_EABI_Tools\FlashProgrammer\Documentation.
However, the latest CodeWarrior PA10 v10.3 does include K9F02G08 NAND flash. This CodeWarrior PA10 is available for download at www.freescale.com/codewarrior