Freebsd-update with a custom kernel and jails

[FreeBSD]

Hi everyone,

I'm totally new to freebsd-update. I used to recompile the kernel and 
the world when I wanted to update. But I think it's now time to take 
advantages of the binary update possibility. I looked at the man pages 
and some googling couldn't answer my questions properly. I need to roll 
out a server quick and I just want to be sure I'm on the good path.

There is my situation:
I want to be able to use freebsd-update to update a FreeBSD 7.0-Release 
installation to the latest security patches (I want an update and not an 
upgrade if I understand correctly). Where this gets more complicated is 
that I need a custom kernel (for ULE, pf and ALTQ while also disabling 
some devices I'll never need) and I want to use jails to isolate every 
services (Apache and MySQL by now).

So, I read at some places that you can't use freebsd-update with a 
custom kernel, but I'm not sure if this apply only in the case of an 
upgrade between release or if I'll need to manually recompile the kernel 
with every use of freebsd-update.

I also read that it's possible to update the jails from the host system 
with the -b flag. In this case, I supposed that I need to update the 
host system before the jail, but is the procedure going to be exactly 
the same?

Talking about procedure, it would be nice if someone could confirm that 
all I need to do is 'freebsd-update fetch' followed by 'freebsd-update 
install' to update the host system.

I'm sorry if this has been explained before but I couldn't find anything 
clear on this. I least, your answer will make a good, update to date 
source of information.

Thank you all for your replies,

Martin