[Q] Renown from Tonnage and not from Patrol Grid

[Dilust]

Hi to all.
SH3 assigns renowns if you reach and patrol your assiged patrol grid. Those are your objective in each patrol of the career.
I noticed that in GWX this additional renown will not assigned for the Indian Ocean and Black Sea grids, due to stock SH3 limitation.

My question is: can I add objectives, in the career, like "Sunk 30000tons of merchant ship" to gain this additional renown instead of "Reach patrol grid XY and stay there 24 hours"?

I noticed that the ammount of renown gained is scripted in the basic.cfg file. This ammount can be changed to 0, but how can I add the new tonnage tasks?

Sorry for my poor english. I hope you can understand me.
Thanks in advance for your replies.
I wish you an happy new year.
Regards,
Dilust