its not the university who pays international students, its that department or library or computer lab or whatever, who hires you. if the department or lab has the budget and they are willing to hire you, all you need to do is, ask the department to write you a letter that they want to hire you and you take that to your international student advisor. now if the advisor says that its the university policy not to hire F-1 students, it MAY be true. one reason, may be since you mentioned that university has quarter semester system, may be school want to make sure that for first 3 quarter semesters student is earning a satisfactory G.P.A in classes and overall. but as far as the financial support issue is concerned, it holds true only when it is regards to making money for tuition, but that is not necessarily true that you want to get a job on campus because you want to make the money for tuition, it could also be for your extra fun activities. Yes it is true that you should always show that you have financial support for you studies but one shold not conclude that one is getting a job on campus merely to make money for tuition, the job money could be use for other luxurious activities.