I don't think you are going to get an enhanced malt/hop flavor from adding krausen. It is a great was to start a fermentation or help finish a stuck fermentation
That is the conventional wisdom (also include carbonation) however, one could also top up a fermenting beer at the last couple points with the hopped krausen (actively fermenting beer (or even the Spiese, unfermented wort).
but the best ay to add hop flavor and aroma is simply to dry hop and it is best to do this after a majority of the yeast has dropped out. For one thing, hop resins tend to stick to the yeast so when the yeast drop out they tend to pull much of the aroma down with them.
That is the conventional wisdom but I guess the purpose is to determine if anyone has tried this and noted a difference in the malt/hop aroma (possibly flavor).
As far as malt flavor goes I'm not sure why you wold think krausening would add malt flavor to a beer. It's mostly yeast.
What is mostly yeast? A gallon of wort boiled with hops and inoculated with yeast? I suppose it would depend on how much yeast is added to it.
I'm going to try this myself on a future beer, time permitting...