9.x installer and GPT vs geom

Hello all.

I just used the 9.0 B3 installer, and it defaults to GPT, which is nice.
However, and there has been some discussions about it, it would be nice 
if the installer warns me that i could get in trouble if i want to use 
gmirror and the like.

Also i find it a little strange that the default mode, GPT in this case 
is in some sort not compatible with the other default  geom structure.
For a newcomer or for people who use gmirror and glabel on a regular 
basis because there somewhat default, it could strike them if they start 
using the default GPT.

It is not logical.
Two default ways to do things that are in a way not compatible.

So a warning at the installer level could make a lot of users aware of 
this, and they can decide what to do, use GPT or go back to the old MBR.
They can start looking at the mailling list and so on to make the right 
decision is GPT acceptable for me or not.
And not install FreeBSD and find out later that you could not use your 
old gmirror and glabel tactics without corrupting the GPT structure.

Just my thoughts about this.

regards,
Johan Hendriks