I'm not sure what you mean by "compatibility problems with the upcoming
ext4 filesystem".   You will get better performance if you remake the
filesystem as ext4 from the beginning as opposed to converting an
existing ext3 filesystem to ext4, but the latter certainly works.
Also, note that that use of a 256-byte inode is not ext4-specific.
It's something we started doing in ext3 since it makes a huge difference
if your system is using lots of extended attributes, as the Beagle
search program and SELinux tends to do.  Ext3 has supported storing
xattrs in large inodes for quite some time.   Unfortunately grub doesn't
know how to deal with 256-byte inodes unless it is patched to do so.
Ext4's sub-second timestamps and some other features also require
256-byte inode, but ext4 (although with fewer features) on a legacy
filesystem with 128-byte inodes.

-- 
[gutsy] Don't change UUID of existing ext3 partition when formatting it for 
install
https://bugs.launchpad.net/bugs/132762
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