Hi there!
I have just finished reading your application, and I have a the following tips/remarks to make:
I would first of all specify your first 'acceptable' kos, as you now only describe a certain 'someone'. There is a moment to certainly know you are able to kos the killer after he killed someone (it just depends on what role the victim who died had).
Furthermore, you could elaborate more on your first example of an 'unacceptable' kos. simply stating you can't kill someone on sus, is not a sufficient example in my opinion. Try to give a specific example of a situation where a certain player gets killed for suspicion unrightfully.
about your activity. You have just been playing this server for about 3-4 days, and if you carry on you will only have about a week of consistent activity. The recommended time of continuous activity is 2 weeks... But hey, I will give you a chance anyway.
It all depends on your activity this week! Also make sure to stay out of trouble..