In your next update in limesurvey, it would be really great under the edit question advanced settings, if you add a Submit sitch, which would allow a survey builder to switch on, if they want the survey to submit once the participant answers that specific question, especially if you have your survey branching of to different groups of questions

A lot of us are not IT literate and don't understand writing response equations or conditions to do this, so by doing this, it would make the process much easier for all your users.

www.limesurvey.org/community/feature-requests