"SyncToy is limited to running only one folder pair at once."

This is false. Here's how to run all folder pairs:

- From the Start menu, select All Programs - Accessories - System Tools - Task Scheduler.
- Select Create Basic Task in the Actions pane on the right.
- Add a Name and Description and select Next.
- Choose when you want the task to start and select Next.
- Choose date/times (if applicable) to run task and select Next.
- Choose Start a Program option and select Next.
- Select Browse and locate the SyncToy.exe.
- Type "-R" in the Add Arguments textbox. –R all by itself will run all folder pairs that are active for run all.