PvZ: Battle for Neighborville - enemy healthbars

I had trouble finding a topic on this, but as a sunflower or a scientist, wanting to heal your teammates while shooting enemies, you need to differentiate friend from for extremely quickly especially in tight corridors.  With this game being as fast paced as it is, can we have ally health bars be green and enemies be red or at least have the option to make it that way?  I don't get why allies and enemies share the same color health bar.