it's quite annoying if one tries to craft item using JEI, only to realize that an ingredient is missing,
but one already has a crafting patter for it ...

Would be nice, to be offered to craft the missing ingredients and to finish up the craft ...
Similar to the way the patter chaining in auto-crafting works ...

E.g. temporary pattern gets created and queued in auto-crafting

PS: sure one can try to setup keeping items in stock (interface / craft / ext storage),
but it gets silly (and a chore) rather quickly ( we are talking hundreds of target items ... )