Custom opening session image

Hello gals and guys !

Been recently back on Mac, OS feels still great since Maverick although have a few complaints about customization. Not that important but a bit frustrating...

First, I find it quite odd that there is no way to easily change the lock screen image.

I can see where there is room for it to be a backdoor nevertheless this is a simple feature that should be adressed imo.

Then, there is what I believe is a bug. When you change your "profile picture" (and by this I mean the small session vignette on the lock screen) to a custom one, once you turn on you computer it only shows the default dark grey silhouette over light grey background. There is no problem with it when you close your session though.

I believe it can be related to the same hypothesis that I suggested for the first issue. Although I tried putting my image inside the default ones folder and it still did not work.

Well, that is not that important but if someone has a fix I would be happy to take it (maybe I am really that bad haha).

Otherwise I think it would be a nice simple feature to work on.

Thanks mates !