the best canoneer is any canoneer who actually listens to his team when they tell him "stop arty" or "cease arty" when they have overran the enemy and are charging in to clean up. Can't tell how you annoyed I get when the hooligans on your team's arty insist on continuing to send rounds downrange even though they are putting them right in the middle of the rest of their team.
Usually I'm the one on the howitzer/mortar pleading for my team feed me info.
"Which building are they in? Call it out and I can nail it"
"Tell me when you pass (this point) so I can adjust fire"
Especially in maps like river crossing. Give me the mortar or the howitzer and I can put a round anywhere you want with one shot. But if you see me dropping rounds in a particular spot and then rush said spot with out opening your mouth, its your fault.
p.s. I wish I could get players on the public servers to pack up into dense little formations like you do in line battles. You'll rarely see 8+ kill shots on a pub match.