Yes, but the best way to get your proposal part of negotiations is to fill out a bargaining survey and speak to your colleagues about also doing the same.  The more people we hear from with the same proposal, the more likely it will make the final cut.  However, this pertains to “rights-based” proposals – things that are optional.  Some proposals are important for human rights, worker rights, and human decency.  In that case, we may advance a proposal anyways, even if only one person is asking for it – such as for reasons of minority protections, or the preservation of due process or worker rights.