It’s been brought up before here and there over the years and while I can’t recall any direct dev comments on the topic I’m going to say that any drastic changes to how the skills function as-is now are unlikely. They have a purpose and they consider it “working-as-intended” for better or for worse. Your best bet is to either mod longer duration in or to use tqFan’s Autocaster.
It should be noted that any duration increase, should they consider it, would most likely result in a nerf to the healing effects - and when you get down to the nitty gritty the healing “burst” is what these skills are really all about.