I'm not so sure this is standardized. For example, looking at the link you posted, my phone (and HTC HD2) doesn't have that exact set of options. It looks like the SIP on my phone is made by Tegic. To turn on word completion on this phone, I adjust the following registry value:
[HKEY_LOCAL_MACHINE\Software\Tegic\eT9]
"MultitapWordCompletion"=dword:00000001
This is also a good time to not just toss you a fish, but show you how to fish (i.e. how did I find this value?).
- Connect your device to your dev PC.
- Open Remote Registry Editor
- From the Registry menu, export the registry to a file. I usually start with just the HKLM branch since that's where 90% of changes take place
- On the phone, change the setting you're interested in and make sure you click "Done" , "ok" or whatever to save the change.
- In Remote Registry Editor refresh the Registry list.
- Export the registry again.
- Use your favorite compare tool (I like Araxis Merge, but any diff tool will work) to compare the two files.
The key you're after will show up (assuming it's saved in the registry).