It seems that Single Player Commands has finally been updated to 1.6.4 (of course MC 1.7.2 is out now…)
With this, you can bind commands to keys as so:
/bind y gamemode 1
You can also use /bindid to set a special key via its key-code. It can’t quite do something like toggling (which would require knowing or keeping track of the current state), but it does let you bind a key to a macro (with the /macro command), so it might be possible to cobble together something that can toggle, but even if not, it’s still a perfectly suitable solution for most applications. (In the case of switching modes, Tab can be bound to creative mode to quickly avoid dying and then switching back to survival can be done with another key or manual.)
In some ways, you can't. In other ways, you can. Most likely, the mods on the 1.6.4 server aren't compatible with the mods in the Technic Launcher. You could ask the owner of the server to list all of the mods and try to see if they're all in the Technic Launcher. If they are, you could try using the Technic Launcher to play on the 1.6.4 server. This might not work if the pack you're using on the Technic Launcher is 1.7.2. You could try to use an older version, but those may be less stable.
If they aren't compatible, another option would be to locate the Startup folder. Open the start menu, and click on All Programs, which is at the bottom. Find the folder named Startup, and right click. Click on the option open. Copy and paste all of the different Launchers you use into the folder. Whenever your computer starts up, all of the launchers will open, so you have easy access to all of the Launchers. However, this method would only work if you restart your computer often.
Another option would be to use shortcuts, but those are boring. To create shortcuts just right click, hover over send to, and press Desktop (Create a shortcut).
The more fun way is to use batch files. Batch files run commands for your computer. To make one open a file, you need to first create one. Create a text file, not rich text, just an old Notepad text file. Name it whatever you want. Open it up, and first type start, then the location of your file. then type param1. So, mine would look like this.
start C:\Users\Kids\Desktop\Minecraft.exe param1
This will open my Minecraft launcher, once it's in batch form. Click Save As, and change the extension on the bottom bar to .bat. Save, close, and delete the other .txt. Double clicking on the new file will open whichever file you want.
I hope this helped!
Best Answer
You can only rebind these system/debug keys:
Highlight Players (spectators) - no default key
Take Screenshot - default F2
Toggle Cinematic Camera - no default key
Toggle Fullscreen - default F11
Toggle Perspective (3rd person view) - default F5
That is, you can't rebind the Toggle HUD (F1) and Toggle Debug Screen (F3) button.
If your PC runs on newer versions of Windows (shudder), the F1-F12 keys have different functions. In order to use them in Minecraft, you must "override" Windows' F-key functions, by pressing one of the following keys when you press your F-key:
fn
WIN
ctrl / shift / alt
There is no mod I'm aware of that is capable of what you request; You can try to find one if you want. You can also use a keyboard/mouse macro.