Good idea, currently there is a no-self-damage mutator that stops players from killing themselves if they accidentally shoot a ball into a wall or or other object that is close to them. This mutator is also what stops the damage (most of the time) when you detonate a ball an enemy is just releasing.
Ideally, I wanted to make combogib balls only have the stock shock rifle damage of 55hp. It's as if the original shock rifle had built in anti-spam because of the risk of damaging oneself or having the enemy detonate your own ball in your face. Also, without the no-self-damage mutator one can do ball jumps which give just a slightly higher jump when timed correctly for a health penalty. This ball jumping isn't extremely advantageous like hammer jumping is but it does allow the flag carrier to accomplish some variety depending on the map, which is a good thing for CTF in my opinion.
The problem with this stock ball damage is that the majority of the combogib players were so used to killer balls for years that when I adjusted the ball damage to lower it there were lots of complaints. So, instead of reducing ball damage the combogib anti-spam was improved so balls can only be fired at the rate of one per second.
Thanks for the great idea though 👍️ I never actually considered that a new version of no self damage (maybe call it limited-self-damage) could just give a limited amount of self damage instead of turning off self-damage altogether. I will add this one to my list to explore one day. Also, I haven't forgotten about the spawn protection we talked about previously which is also on the list 🙂