Found a copy of the version 10 manual online. It notes this for HFS Standard:
Creating a Temporary Partition
You can create a temporary partition on your hard disk that can be used to set up data you want to record to a disc. Temporary partitions allow you to have better control over the layout of your data and how its windows are
arranged and displayed.
To create a temporary partition:
1 Choose Utilities > Create Temporary Partition.
2 Enter the size for the partition. Choose a size that is appropriate for the disc that you intend to make from the partition. For example, 650 MB is suitable for a CD and 4300 MB is suitable for a DVD.
3 Choose the file system format for the partition:
■ Mac OS Extended: The best choice for discs to be used on Mac OS 8.1 or later, including any Mac OS X system.
■ Mac OS Standard: For discs to be used on computers running Mac OS 8 or lower.
■ UNIX File System: For discs to be used on the UNIX operating system.
4 Click OK.
Toast mounts the partition on the Desktop. You can add files or folders to
this partition.
You can actually do the same thing in Toast 11. Big problem, though. The HFS Standard disk image it creates and mounts on the desktop is read only, so you can't add anything to it. One of the members at Roxio's forums had this to say:
I just checked and got the same result. The permissions are for read only. However, I found a workaround. Instead of creating a HFS Standard partition, create a HFS Extended partition. When it mounts the permissions allow read & write. Add your content in the Finder. Now choose Mac Volume as the format in the Toast Data window. Select the mounted partition and burn the disc. The burned disc will be HFS Standard.
I haven't tried his approach, so I don't know if that's correct. I also tried using Disk Utility to create a .dmg I could drop into Toast 11, but you can only create HFS Extended images.