I am working on doing something similar.  I hate the way a selective works,
having to name all file systems etce etc.  So I made another management
class in the same policy that has copymode of ABSOLUTE.  I am going to
schedule a command instead of a backup.  The command will be basically
DSMC.exe incremental -OPTFILE=dsmfull.opt  .  THe DSMC.EXE has to have full
path qualification.  The dsmfull.opt is a copy of my normal option file with
the new management class being defined in the INCLUDE/EXCLUDE statements.  I
added an
INCLUDE ?:\...\*  FULLMGMCLASS   at the top.  I have tested the line command
and it works.  I am now setting it up to test it as a scheduled event.  My
first attempt failed but I know it can work.  It is similar to what we do to
handle our DB2 backups which are scheduled through an external scheduler,
(it schedules scripts to initiate backups  using a different mgm class).
Matt