This mod does as it says on the tin -- it guarantees the side door spawn on Diamond Store allowing stealth gameplay without having to restart until it does spawn. It will not affect whether the camera does or does not spawn, nor whether it will be a Titan camera, those are all left untouched and you will still have to deal with that accordingly on any given playthrough.
This is part of a group of some small edits I've made to a gameplay overhaul I use, ported over to be compatible with the standard game for those who may want them.
Special thanks to @erushinj for some guidance with making these edits