Yes Jerich that's possible at Scorpion. However spraying the flag at position you like is highly uncertain even when you do it alone but when there are enemies shooting at you while you are trying to do it, it's much more harder.
Also when you consentrate spraying the flag, you play yourself out of game so for example in 3on3 game your play causes 2on3 powerplay for enemy, (since you are at top trying to spray the flag somewhere).
Also those places you mentioned. Especially the top center placing might make it actually easy for attacker. If the flag is close to opc (only player collide), enemy might be able to nade boost it into your side and play easy cap. Or the enemy can flag throw it. Or just spray the flag into path again.
In any case, flag will return soon and then you need to start all this again. Play couple gathers/cws and you see that tactic doesn't work. Yes we've tried it.