Honestly I don't consider a room with a bed in it birdproofed (they can chew through the mattress and hurt themselves in the coils or by choking on the stuffing, they can get stuck between the mattress and the frame, they can smother themselves getting stuck in blankets and pillows if you leave bedding on it). Of course I would be fine at leaving a bird in a bedroom if I was home, but gone to work? For me it would be a 100% converted bird room or a cage--no still usable bedroom that is bird proofed. I am hoping all the outlets are at least covered with baby safe caps even though you still use it as an extra bedroom? Maybe I am just a safety fanatic, but if I am not in the house then I am uber conservative about where I am willing to leave my birds, but maybe I have seen too many lost feet over the years.
As for the not pooping in the cage--holding for hours and hours is not normal for any size bird unless the cage is very small. It is dangerous. If they hold but eventually give in and poop, okay, (though you want them to give in within an hour or two, not when their body flat out FORCES them) but if they refuse to poop at all like the OP says? Imagine if you are injured in a car wreck and go to the ER for a broken arm. You will be there MANY hours. The bird MUST poop, which means this is a training issue that should be addressed rather than something to be considered normal. It has nothing to do with a bird's size or smarts--I have kept all size birds. It has to do with the fact that SOMETHING is causing this mental block and it is necessary to find out what it is, whether it's a cage size, amount of toys, a paper issue like Plum's Mom suggested... if it is simply a mind issue then training needs to go into it so the bird will experience the normal behavior of pooping in its large cage rather than having a "this is my nest" idea about a large space. Consider how your bowels would feel if you held back until you literally were forced to poop your pants--and birds have a LOT less control over their pooping than we do because of how their bowels and anus are constructed. Just because you have seen birds do it doesn't make it normal or safe. This needs to be addressed in case you CAN'T "free" your bird to poop.
Edit: I was thinking and we may be saying similar things but getting twisted by a word: when I say "normal" I mean something like this metaphor: It is normal for an adult human being to ONLY poop in a toilet or some place reserved for pooping. However, if a human being were locked in a room for five days, it would NOT be normal if the human chose to try and hold it until it severely strained his bowels and was forced out rather than to pick a corner and go there. It is normal for a human to be able to overcome their mental block and disgust before it becomes painful (and is unhealthy for their bowels) and go in a corner. I am saying that, when it comes down to it, it's not normal if your bird does the birdie equivalent of hurting his bowels and having it erupt out rather than choosing to go somewhere he would prefer not to.