The leading cause of game crashes on startup is save incompatabilities. We're working toward making saves backwards and forward compatable, but it takes a long time to wrestle the infrastructure into the right place to make it work.
Re: skill progression. I agree slowing down skill gain is going to be part of the solution, also there are probably some effects in particular that need to be nerfed, like headshotting (doesn't make sense at all for a jabberwock), fire effectiveness (I'm not talking about your molotov use, more of the "use a paper wrapper to stunlock a jabberwock" strategy), but perhaps jabberwocks should be somewhat fire resistant.
Digression: Personally I'm of the uber-realistic school, so if it were just up to me I'd base skill progression on the adage*, "mastering a skill takes 10,000 hours". However, mastery by this definition is "world-class competitive", and the benefits would be extremely front-loaded. This would probably require scaling up the max skill numbers massively to have appropriate resolution, and would completely replace skill rust. Another outgrowth of this direction would be that typical level of skill for many things would definitely be non-zero, so e.g. driving, cooking, computer, first aid would generally never start at 0 outside of a specific negative trait. I'm... not at all sure there'd be any support for this kind of thing though, so I'm really not pursuing it.
Sorry if this has been mentioned before, but I know it was a point of interest here. You can now install headlights pointing in arbitrary directions.
*Did some reading, it's not just an adage, it's backed by research, interesting.