Spirou: I don't understand what it is that you're requesting. There already is a notification for a possible promotion. The piece is marked clearly right next to the board at the top where it can't be missed. I've also noticed that when this happens a sentence appears in red telling you about the possible promotion. When this sentence appears it also shifts the page slightly and this also makes it easier to notice the possible promotion.

Is what you're asking for something like coloring the actual piece on the board itself? If so, you're probably right that the purists will object. For them, they probably don't like what is done now either, but I get by just fine with how the promotions are handled as is.