A signature is irrelevant in determining whether a relationship is or is not contractual – and therefore whether someone is or is not entitled to employment-related rights. For a detailed explanation of when a contract might (or might not) be created with a volunteer, see The Russell-Cooke Voluntary Sector Legal Handbook (Directory of Social Change, 2009), section 39.4.
Might be on my own with this one… but I feel passionately that if you are practicing good practice in volunteer management, you don’t need signed agreements because at each step of the volunteer experience you have explained the role, managed expectations and boundaries and provided training and support relevant to that volunteer role. personally I think volunteers can be just as effective without agreements and also think that if they are used they should be used consistently. Not sure my thoughts are particularly useful but hopefully it helps, ally.