To set in command line via pf=

One can use the pf= command line parameter to specify a file containing customization items and then address that file.  For example one thus could use

Gams myfile pf=c:\place\fileofcommands

Where fileofcommands is one containing entries like

Eolonly 1

Ps=9999

Pw=90

Errmsg=1

Eolonly 0

Use of the eolonly parameter allows one to place one command per line.