I have a login form loaded from the config file that consists of two input fields and a submit button. How can I add the attribute value="login" to this code? I also want to add a class name. How can I do this?

; general form metainformation
user.login.action = "/user/login"
user.login.method = "post"

; username element
user.login.elements.username.type = "text"
user.login.elements.username.options.validators.alnum.validator = "alnum"
user.login.elements.username.options.validators.regex.validator = "regex"
user.login.elements.username.options.validators.regex.options.pattern = "/^[a-z]/i"
user.login.elements.username.options.validators.strlen.validator = "StringLength"
user.login.elements.username.options.validators.strlen.options.min = "6"
user.login.elements.username.options.validators.strlen.options.max = "20"
user.login.elements.username.options.required = true
user.login.elements.username.options.filters.lower.filter = "StringToLower"

; password element
user.login.elements.password.type = "password"
user.login.elements.password.options.validators.strlen.validator = "StringLength"
user.login.elements.password.options.validators.strlen.options.min = "6"
user.login.elements.password.options.required = true

; submit element
user.login.elements.submit.type = "submit"

user.login.elements.username.options.value = "login"
user.login.elements.username.options.class = "....."

; submit element
generic.error_report.elements.submit.type = "submit"
generic.error_report.elements.submit.options.value = "Submit Error Report"
generic.error_report.elements.submit.options.class = "testclass"

<input type="submit" name="submit" id="submit" value="Submit Error Report" class="" />