I also would really like this.

My idea for how it could work: instead of presenting the "parameterize dialog" on button down (current behavior) if the dialog was on button up, you could click, drag out a bunch of buildings, release, and then fill out the prompt to parameterize all of the "dragged ...

I also think this feature would enable much better train management. Unfortunately, because if there are more trains which can both process that interrupt, they will both process it in the same tick, solutions with circuit network won't work, as they always take at least one tick to update the ...

It will remember the parameters (even the names) if you first paste the blueprint and fill the parameter icons as the corresponding parameters.
I.e. if you want to make a change, first build the blueprint and when it asks for parameters, set the "Item to build" parameter to the 0 param signal and so ...

I'd like to join in on this, even just allowing the common ingredients to stay in the ingredient slot would be a huge improvement and I don't see how it could be abused.