1) You can insert mailto links in survey elements (questions, group descriptions, end message...) with the HTML editor.
2) Question setting "Answer width" - manual.limesurvey.org/Question_type_-_Ar...h_.28answer_width.29
2) Question setting "Answer width" - manual.limesurvey.org/Question_type_-_Ar...h_.28answer_width.29