Hello,
Yes it is possible, on your branch... You just need to look in lecdon_telemac3d how a keyword is treated with its type (INTEGER, etc.) and its rank (INDEX in the dictionnary) in the list, find an available INDEX, choose a Fortran name that must be added in the DECLARATIONS_TELEMAC3D.
So :
1) find an available index, let's say 95 for an integer
2) add a section in the dictionnary like :
NOM='MON NOUVEAU MOT-CLE'
NOM1= 'MY NEW KEYWORD'
TYPE = INTEGER
INDEX=95
etc.
3) Add the Fortran key-word in DECLARATIONS_TELEMAC3D
INTEGER MY_NEW_KEYWORD
4) change lecdon_telemac3d.f :
MY_NEW_KEYWORD=MOTINT(ADRESS(1,95))
Recompile all telemac-3D (requested by the new DECLARATIONS_TELEMAC3D).
That's all... regards,
Jean-Michel