Better use of Gankplank's Silver Serpents

Hey , I just saw a video talking about this , and i really thought it was a good idea .

Since everyone who plays GP , don't improve ther ults to "RAISE MORALE" ( only if the other 2 are already improved) , why don't substitute it with a extra slot for you E ( costing 500 Silver Serpents as well) . This way you can carry up to 4 barrels , and it would actually be something useful on GP.

Tell me what you think.

Cheers.