Yosemite Disk missing from Snow Leopard Startup Disk

Question

I recently installed Yosemite in a triple-boot configuration with Snow Leopard and Windows 7.
Note: to anyone trying the same  I learned the hard way that the Yosemite has to go after Windows or Windows' 4-partiton limit will be exceeded and it won't install. My partitions look like this: (Invisible) EFI, Snow Leopard, Windows 7, Yosemite, Recovery.
But the topic of this post is the fact that the Yosemite Disk does not appear in Snow Leopard's Startup Disk in System Preferences. I've seen a few other posts about this and want to share a work-around I've found. Here's the procedure:
1) Boot into Yosemite.
Open System Preferences>Startup Disk.
If the Yosemite startup disk is not already selected, select it and reboot.
2) In terminal, enter these commands:
     nvram efi-boot-device > ~/desktop/YosEFI
     nvram efi-boot-device-data >> ~/desktop/YosEFI
The YosEFI name is arbitrary; call it whatever you like.
The > and the following code on the first command creates a file named YosEFI on the desktop and sends the output of the first nvram command to it.
The >> on the second command appends its output to the existing YosEFI file. A single > here would overlay the output of the first command.
3) Open System Preferences>Startup Disk.
Select the Snow Leopard disk and reboot.
4) Copy the YosEFI file from the Yosemite desktop to a folder of your choice.
5) Create a file in Text Editor (I called mine BootYosemite - with no .txt extension), and put (a version of) this code in it:
     sudo nvram -f ~/Documents/YosEFI
For simplicity this example assumes the YosEFI file was saved to your Documents folder. Adjust the path as appropriate.
6) Open Terminal, navigate to the file created in Step 5 (BootYosemite), and make the file executable:
     chmod 755 BootYosemite
7) You can now double-click the BootYosemite file and it will open a Terminal window and prompt for an Administrator password. When the command runs, it imports the efi parameters from the YosEFI file to NVRAM and the next system restart will boot into Yosemite without the need to use the Option key.
Of course, it's debatable whether being required to enter an Administrator password is really any easier than holding down the Option key, but for those who want a work-around for the missing Yosemite in Snow Leopard's System Preferences>Startup Disk, this is one solution.
8) If you really want to get creative, you can put BootYosemite in your ~/Library/Scripts folder (create the folder if you don't already have it) and run it from the Menu Bar.
To add a Scripts option to the menu bar, open AppleScript Editor (It's in Applications/Utilities), open Preferences, and check Show Script Menu in Menu Bar. You'll need to re-logon (not reboot) to pick up the new script and show it on the Menu Bar.

Answer 1

Simpler is to use the donationware QuickBoot app.
27" i7 iMac (Mid 2011) refurb, OS X Yo (10.10.1), Mavs, ML & SL, G4 450 MP w/10.5 & 9.2.2