I did think of another feature that could help people wanting to do custom syntax for notes - an option in the config file for each note type that specifies a regular expression to match cards for that note type, with capturing groups for the different fields.
So, for example, your one could be:
#+ (<question>.*) \n (<reply>.*)
^ that assumes the reply is a single line.
Thinking about this more, this could be pretty powerful - e.g. you could use a remnote-style front::back by defining an appropriate regular expression! I’ll think about adding this to the next update.