Here are examples of how to start a discussion on other sites, which might be examples for how to do it onwiki with reply tool:
- On Flow, it is an already opened text input box on top of the talk page with gray text 'Start a new discussion', just click in the box to put a cursor in it
- On Facebook, it is an alredy opened text input box on top of wall with gray text 'What is on your mind?', just click in the box to put a cursor in it
- On Twitter, there is both an adready opened text input box on top of the page with gray text 'What keeps you busy?', and a big blue 'Tweet' button in the left side bar. On mobile there is a plus button in the lower right corner when you follow the stream for a specific hash tag
- On LinkedIn, there is an already opened text input box on top of the page with gray text 'Start a post', and an icon of a pen in a box next to it.
So, these examples all lead the way to having an already opened input text box on top of the page. For on wiki talk pages the new discussion should end up at the bottom af the page. Or you are bold, break convention, and start top posting of new discussions, just like all other sites. Several of the above mentioned sites, but not all, will pop up a dialog box to enter the new discussion, which naturally blocks doing anything else on the page, including replying to existing comments. Specific for on wiki discussions will be to require a head line or title, and Flow is an example of doing that.