Can these (and if so how) be negative values. For example, I know nothing of Linux, and as such I spend quite a while clicking the skip button. I admit, it's not a hardship, however, I'd like to be add -linux -bash and just have those removed totally from my results.
-1 because content isn't a reason to close. Look at the reasons to close:
duplicate of... - This question has been asked before and already has an answer.
off-topic because... - This question does not appear to be a meta discussion about Super User or the software that powers the Stack Exchange network within the scope defined in the help center.
unclear what you're asking - Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.
too broad - There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.
primarily opinion-based - Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise.
With the slight exception of off-topic becuase... and duplicate of... none of these are content related but rather quality related.
Personally I don't see a need to filter out question in any way as being an expert in the questions field isn't necessary to knowing whether the question is a good fit here or not.