In short, no - we only accept one talk proposal from each speaker candidate.
One of our core values is finding highly valuable talks to be presented to our attendees. This means that we extensively vet each talk proposal. By setting this rule we would like to invite you to invest all you've got into your single proposal, and at the same time help us save some time in the selection process.
In case you have many ideas and a hard time figuring out what would fit the ADDC best, we invite you to reach out before you submit your talk. We would be happy to advise you on what will suit our audience better.