sp_repladdcolumn - is it possible to supply a list of Publications to add this column on?
sp_repladdcolumn is deprecated unless you have SQL2000 subscribers, you should use the Replicate Schema changes option on the publication. Assuming you have that set to No, I guess you could still use the sp_repladdcolumn, and if you look at the source for the proc, it looks like it has handling for accepting a comma separated list of publications, but using it is venturing into undocumented handling of a deprecated procedure...i.e. no guarantees.

sp_repladdcolumn  @source_object =  'fooTable',  
                  @column =  'fooNewColumn',  
                  @typetext =  'int' ,  
                  @publication_to_add =  '[pub1],[pub2]' 


EDIT: Publication names need to be in [] for it to work as in the code of sp_repladdcolumns it has:

select p.name, a.name, a.pubid from dbo.sysmergepublications p, dbo.sysmergearticles a   
where p.pubid=a.pubid and a.objid=@objid and p.snapshot_ready=0 
     and (p.name like @publication_to_add 
         or charindex('[' + p.name + ']', @publication_to_add)&gt;0)