Keeping NetBSD disklabel up to date

[beaker <b3ak3r%lavabit.com@localhost>]

Is it safe and sufficient to run 'mbrlabel -fw <device>' on NetBSD 
whenever there has been partition resizing (usually via Gpartd) such 
that the disklabel no loner relects the current partitioning state?

System in question is an old 32bit i386 with MBR partition scheme on 
sata disc hosting several Linux partitions and one NetBSD FFS2 
partition.  Bootloader is GAG, not GRUB or native NetBSD bootloader.

If I wipe the disc and recreate a multi-boot setup is there a better 
partitioning scheme I could use for such an old system?  I don't believe 
GPT is supported on the system in question.