To be honest I haven't done it with Toast 6. the last bootable disk I did was with Toast 5. Both of which I still use. You know don't you that even with the official startup disks for OSX that you need to hold the 'C' key for it to start up unless you previously selected it by the startup prefs. So I wouldn't be over-concerned about that really. In OS 9 Startup disks were easy to compile (I used to create open disk images/temp partitions that I added items to &):

Making a Bootable CD: The CD you create is bootable on a Macintosh system. Note: This feature is available only on Mac OS 9.1 or later.

1 Make sure Toast is open and the Toast window is active. 2 In the Toast window, click Data. 3 To see the Data formats pop-up menu, click the format name. 4 In the pop-up menu, choose either Mac OS CD or Mac OS and PC (Hybrid) CD. You cannot create a bootable CD with the Mac OS Extended choices on the menu. If you try, after you click Record, Toast will display a message indicating that a bootable Mac OS Extended CD is not possible. 5 Drag the appropriate blessed System Folder into the data window. Make sure you have the correct System Folder for the computer you plan to boot from the CD you are creating. Apple places different items in the System Folder, according to the specific computer where it is used. 6 Change the name "Untitled CD" to the name you want the CD to have when it mounts on your desktop. 7 Drag additional data you want to copy to the Data window. 8 After collecting all the data you want, insert a CD into your CD-Recorder. 9 Click the Record button. 10 In the Record dialog box, click Write Disc. The writing process begins at the selected speed. When all the data is written, Toast pauses briefly, then automatically verifies the data. (You can prevent verification by clicking Eject during the pause.) 11 When you see the message, "Verification completed successfully," click Eject