I feel she should retain her inability to deal with to much poke as thats one of her few, actually meaningful weaknesses. Think letting WM talent in to slightly more pve healing ia fine but i wouldn’t want it to be based on the damage she deals. Even healing for 5% if the damage she does to pve would be noticeabley powerful.
It’s something that Martyrdom at 4 already does but i dont think there would be to much harm in giving Zealous Spirit at 7 some small throughput bonus. Maybe a bit of health per second for everyone with zeal. Imo, this talent does almost nothing and it competes with a cleanse for crying out loud (and a relatively good one at that). Giving up a cleanse in return for somewhat shoreing up a weakness sounds like a reasonable trade to me.
however
I bet letting us cast W on mercs (and maybe large monsters to) would change absolutely nothing about her viability but it would make her more fun. So i think that should happen for that reason alone.
Give scarlet aegis and radiance more of a try. They are both super good and can be taken in any build. They do wonders for your staying power in fights. Just dont pick scarlet wrath at 13. I’m afraid that talent still does almost nothing 
(Imo scarlet wrath should change talent tiers entirely.)