Digital BW, The Print

Any experience as to whether IP can reduce the
> metamerism substantially will be appreciated -- I have no 
control over how
> the prints will be exhibited. 


As far as I understand color management,  metamerism - at first 
line - is an ink problem and not so much a function of a certain 
software.
So it would be unwise to believe, that a software could be able to 
reduce an ink problem substantially - especially if you have no 
control over the light conditions in which your prints will be 
shown.
Actually the different profiles which IP is offering for one paper 
are built to overcome this problem by targeting the profile to a 
special light source.
So, if you really have no control over the light, one could only 
recommend to use a profile which is targeted to a "mixed light 
environment"  (IP ECWF2 profiles), that should be a good 
compromise at least.
Bernd