Healers on the walker during sieges

[Wild ✓]

Hello spadie
My question is the following, until when will be allowed the use of several healers in walker during sieges?
players that have a lot of coin use this advantage to defend/attack castles, so the sieges are totally unbalanced to the side that has more healers in the walker.
My opinion is that if the player wants to play as a healer in the siege, he should be active on his character and not use the walker, because when the walker is used it becomes a mess and ends up disturbing the siege experience.