In one of her final acts as UW-Madison chancellor, Biddy Martin wants to set aside $2.3 million so that low- and middle-income students won?t have to pay a proposed 5.5 percent tuition increase. Martin sent a letter to the Board of Regents and UW System President Kevin Reilly on Friday seeking approval to use money from a 2011-12 tuition hike so that families with annual household incomes of less than $80,000 won?t have to pay the increase. Reilly responded Tuesday, letting Martin know the UW regents won?t set tuition and vote on the operating budget until Thursday and it would be ?inappropriate to pre-empt that action.?