FFS permission issue

[marc]

Hello,
I have just finished configuring my OBSD installation, dd`ed it onto the first HDD [the second one containt two partitions:

1. OpenBSD installation partition which contains few typical system slices
2. OpenBSD FFS storage partition [which is accessible from within OBSD as "wd1i"]

I was going to make wd1i writable for me [user was added to wheel and operator group], but apparently I have no luck with writing onto this partition.
I tried to change permissions, but It gave me nothing. The only thing that helped was to chown -R user /dev/wd1i.
I really want to avoid messing with /dev permissions if possible, so my question is: is it possible to let the regular user mount wd1i in a non-invasive manner?
What should I configure? and how should the /mnt dir permissions look like?

Thanks for any help
marc