Okay, I haven't read the whole thread, but hey I'm going to jump in anyway. If I'm repeating what has already been said I apologize.
First of, Akon, WELCOME to the precentral threads. And yes there's lots of information here about how to get your pre working the way you want it to.
Firs off, the pre is a keyboard centred device. And if you're coming from the world of Apple, you might find the My Virtual Keyboard app helpful. Personally, I love it. Because everything about the Pre is centred around a hardware keyboard, software keyboard solutions will always feel like an add on, but I find My Home Keyboard to be a rock solid solution. It's not the iPhone keyboard, and it never will be. Rumour has it that HP will be launching a keyboardless device in the future, and I'll be curious to see what you think about it. Personally I'm a hardware keyboard guy and I always will be. I like having the extra screen real estate that you get without a software keyboard, but that's personal taste. To each his own.
And I actually agree with you that the back gesture is not very intuitive. And my sense is that HP is getting rid of it for WebOS 3.0 devices. The thing I LOVE LOVE LOVE about the back gesture is... if you have your device set to advanced gestures, you can easily use the back gesture to swipe between applications. And it is a god send to me. I'm a big multi tasker. HUGE. All day long, I'm going from my email app to a web page. Having this gesture to easily swipe from one app to another and back again is a god send, and in my opinion, better than the way you switch between applications in iOS. I've had races with friends with iPhones to switch between email and a web page, and lets just say I'm not moving to iOS anytime soon. When HP gets rid of the gesture area, I'll be sad, unless they come up with something that gets me switching between applications as fast. Of course, if switching between applications isn't important to you, then this is no big deal.
And finally, yes, you can 'jailbreak' your Pre to your hearts content without having to worry about HP coming down on you. As a matter of fact, HP just gave the 'jailbreaking' community an early Touchpad to get them ready for the launch. Imagine Apple giving a pre release iPad to the jailbreak community. There's lots of info about getting Preware on your phone in the forums, you'll find it all if you search.
One patch you should try is the Today menu in your top bar. I freaking LOVE it, and it's something that Android and Apple should steal. (And HP should put in every device.) Let's say you're in an app. ANY app, and you want to know what your schedule is today, you touch the time and your agenda slides down, it doesn't take you out of the app, it just gives you a menu that slides down and right back up again, and then your back to work. LOVE it.
Finally, here's something you probably don't know you'll love, but I'm certain you will.
Get yourself a Touchstone. Just do it. You'll love it. I love wireless charging and it's one of the things that I just could never give up. It's hard to explain, but when you've had it for a while, you realize it's the future, and it's hard to go back to plugging in your phone to charge it up.
And to answer your question, now that HP is involved, there are many signs of life for WebOS. (Not so much the Pre 2. I have one, and it's great, but I'm really looking forward to the Pre 3, I won't lie)
Okay, as I said, this has probably been said before, I haven't read the whole thread, but I just wanted to add my 0.02 cents.
Hope this helps.