A few queries regarding the beauty that is Nokia 5...

Question

I got this beautiful lil machine a lil over a week back. It looks lovely, and sounds even better. And even though, being a student/intern, it cost me more than my monthly salary, I am mighty pleased I got it. And despite the opposition before, it's a great hit, both at home and work. 
Just a few queries regarding the usage from my experience so far, the answers to which I could not find in this forum and a few other review sites. [Apologies if I'd missed something.]
 1- First, the battery. It only lasts for a little over a day on full charge. From what I'd heard and read, it looked like it should last quite a bit a more, atleast 2 full days. The phone even hung up a couple of times, while recording/playing video. Upon which I had to remove and reinsert the battery. How seriously wrong is this ?
2- How do you forcefully exit an application, if need be ? It suggests in the guide, and from the reviews I read, there's supposed to be an exit and a start button with the applications when you bring up the task manager. Where're they?
3- There's this option where you can insert a Slideshow as your Wallpaper. But when I go to it, select the desired images, [ Tried various random images, yes ]it only shows Options and Back button, when select Back, it just goes, well, back. Nothing really happens to the wallpaper. How does that work ?
4- This might seem like a petty issue, but it can be pretty annoying. Once you go to Options and tell it you are marking, e.g. in the Inbox or the File Manager, how do you mark multiple items, WITHOUT having to go to Options >Mark >Mark/Unmark for each item ? What's the point of having a seperate Marking option in the first place then, when I could just Move or Delete each item seperately anyway. 
5- And last, any news on a free full version of a document viewer ? From what I looked up, it costs around US$70, which is about a quarter of the phone's purchase price itself. And that's not a modest sum, that too for a basic application such as this, for a anyone with my status.
Just so any prospective buyer or amateur user such as myself doesn't get scared off by the seemingly long list of inquiries, the phone's an absolute pleasure to use. Specially, for someone with their first Touchscreen/Symbian experience. I got this phone after a LOT of research, both online and in the field. And it's bloody well worth it so far. 
I know, it's a huge post, but you'd have my utmost gratitude for an accurately detailed response. Thankyou. =)
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Answer 1

Why of course. Something happening to your phone during the process would brick it, not to mention that the attempt would install something in your phone that voids the warranty, meaning that you just made yourself a very expensive paperweight. ^_^. We're not really allowed to talk about it, other than the fact that with the above possibility, I strongly advise you not to do so. There is a way to do it without hacking it. I know of people who have managed to do it without hacking, but it was on the 5800. Hmm, ok, maybe they'll work for you too though.
http://forum.dailymobile.se/index.php/topic,4254.0.html 
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