In an upcoming D&D 5e campaign I'm considering playing a life cleric to 10th level with a group of four other players. We haven't been told the campaign we're playing and I don't yet know the other player's choice of characters and classes.
As an interesting role playing experience I'm considering playing a life cleric gnome whose flaw is they have become fed up with everyone asking for the smallest of heals, and abusing their divinities gifts - therefore the character only intends to heal those who they feel really need/deserve it.
I'm proposing a rule that my character will only heal party members who are below 1/2 health (open to change) or in desperate need; however, I do not intend to be enforcing this rule stubbornly and without reason. An example of this role playing from the character will be: "scratched your arm, aye? Shrug it off". This will hopefully prevent the character becoming a walking ambulance.
I'm fairly confident both the DM and fellow players will be accepting of this rule and trait, however, I'm concerned it may cause the character to become under-powered as the campaign progresses. This is because the only other role I can envision a life cleric fulfilling is a tank, and I don't believe a gnome would achieve that very effectively.
I would like to know what paths/roles are available to maintain the character is mechanically potent/useful while maintaining an adverseness to continuous healing.