Fire damage right now is way too easy to fix with everyone basically being able to do it equally.
What would be amazing is some form cost too it... Say solvent cans with a graduated application similar to Graffiti removal. Or a supply pack or tool belt that essentially costs 500chy per use from the supply terminal that WCS can fill for free at home base.
Would be really nice to see some form of consequences beyond someone walking in and fixing things in a minute or two for fire damage, when most things that cause it are relatively expensive and difficult to acquire.
Keep the time to repair the same but require a cost too it would be my suggestion.