Hi Dan,
sounds like a reasonable request but it would be a lot of work in the Projucer’s code and adding some UX to the Projucer to support it nicely.
Also, right now, the Projucer does not even support setting individual compiler flags for debug/release (apart from optimisation flags, code-stripping and options related to floating point support). So we’d probably add that first.
It’s not something we have time for right now but I’ve added it to our backlog.
Fabian