Just installed the ynh8 #yunohost app integration on my flohmarkt.
I added an hourly check of the user database of #flohmarkt to send out an email notification for changes.
To enable admins through the web gui to change the address I added a configuration panel and while at it I put the setup URL for the initial setup of a new flohmarkt installation on the configuration panel, too.
Now it should be easy to install and initialize a flohmarkt instance by only using yunohosts web gui.