It seems to me that you are taking the easy way out on idea #5390. This idea has almost 3200 votes and the comment made by the developer was..."I don't know what the user wants..so we'll do nothing"..here is the actual quote:

"I have no idea what size / and /home should have by default,
I always use 6 GB for / and the rest for /home, but if someone wants to use huge databases, that'll break.

Thus I think we should stick to our current partitioning and rather improve the UI for keeping /home. There is always manual partitioning for people who actually care."

If the user selects "I care" ...then ask!!
Without changing the defaults on the installer, an option could be added which allows the user to select whether they are interested in making the a /home partition. If that option is selected the easiest way to do this is would probably be to offer a few options:

1. Setup "A" - default + /home of rest of hard disk
2. Setup "B" - Default + /home of X (user defined)
3. Setup "C" - I want to manually define my partitions (advanced)

I don't think the lack of information should be a show stopper for this popular idea!
Let me know what you guys think.
Thanks,

Jorgevan007