The approach you suggested was suggested in the thread of ticket you 

Brian Rosner: "I am a +1 on a configuration parameter since the alternative 
by subclassing is a bit too involved for something fairly trivial."

Why was it rejected? What new arguments are you bringing to the table that 
weren't considered before?

You say that subclassing is a burden, but I'd argue that even redefining 
the field on the model form isn't DRY, at which point what about making the 
customization in the form's __init__()?

self.fields['field_name'].label_from_instance = lambda obj: 'new label'

I think the barrier to violate the Zen of Python ("There should be one-- 
and preferably only one --obvious way to do it.") is a bit high here, so 
perhaps you could elaborate on how this is causing maintenance problems?

On Tuesday, September 20, 2016 at 9:52:55 PM UTC-4, Lawrence Vanderpool 
> Older related ticket:
> My rough draft of proposed changes: 
> The problem of setting the label for ModelChoiceField is one that comes up 
> on IRC every once in a while. It's a common enough problem that I think the 
> documentation-recommended solution of subclassing ModelChoiceField and 
> setting label_from_instance ( 
> ) is overkill, and probably a maintenance problem.
> ModelChoiceField already implements an optional callable in the 
> `get_limit_choices_to` function. This change would implement a similar API 
> to allow a callable to be passed in to the constructor rather than having 
> to do the subclassing dance.
> It'd still be backwards compatible, but the documentation should be 
> changed to reflect the "easier" solution of passing in the callable.
> The old ticket was labelled wontfix, but I think we should take a look 
> again. I'd love for this to be my first contribution to Django! Thanks for 
> any feedback. And if I forgot something or broke a rule for the ML, I 
> apologize in advance @.@

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