The complete list, idea submission field, and voting mechanism, can be found here: http://www.airbnb.com/safety#feedback. Look forward to seeing your submissions. -Joe
However, it's notable that the community's two most popular requests – mandatory photos, and repercussion-free refusal-to-rent-for-any-reason – would each be arguably illegal for traditional landlords due to antidiscrimination rules. AirBnb may filter out the meth-heads only to have an equally-costly parade of federal regulators and attorneys-general show up.