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Yes, there are ways. Since you mentioned Titanium Backup, I can safely assume that you are rooted. One thing to keep in mind though, is the Android version required pretty much means REQUIRED. If you are running 2.3 and the app requires 4.0, you shouldn’t waste your time.  

Not too much, it was only 8mb. In addition to the ubiquitous “performance and stability improvements,” it also makes some improvements to user account management. Some Nexus 7 users also report improved touchscreen performance, but this could be a placebo effect. As far as I know, Google didn't release a changelog.  

I’m not certain about the new Nexus 7 since it is running Android 4.3, but on the first gen version with Android 4.0 you can sideload flash. I’d give it a try, you can install it from here:. http://forum.xda-developers.com/showthread.php?t=1931671  

I am not familiar with that device, but if it doesn’t have a GPS receiver, that is a question of hardware, not software, and you clearly can’t download hardware. However, even without GPS you can get location data by using a combination of WiFi and cell tower data.

Basically, because it takes less power to ping a WiFi network than it does for a cell tower, and even when in sleep mode it is still checking for IMs, SMSes, etc. Here is a more detailed explaination, if you are interested: http://www.androidcentral.com/android-101-save-battery-keeping-wifi-alive

In addition to the very valid points Christopher made, I also think many people install an app launcher because it can make their Android device look cooler. It also opens up new Widget options, and let’s you more easily access those apps you decide are most important. So basically: Widgets, app access, and looks cool.

There was a recently leaked (or planted or fake) document from Office Max that said it will be on sale next week and the 32GB model will retail for $269.99.    

Your screen uses a lot of power when it is active. Decreasing brightness can add to battery life significantly. If you are used to 100% brightness, try dropping it down to 80%.

There is a difference. The Nexus is running pure unadulterated Android. The Google Play Editions apparently still use the manufacturers kernels, but do not have the bloatware and the UI stuff on top of Android that both Samsung and HTC love to skin their devices with.

It’s not exactly a case of hacking with the PRISM system.

It won’t be free. Considering the companies current dismal state in the US, I don’t see how it could hurt sales much, after all taking a little away from a little still leaves you with a little. Now that IT has been supporting iOS and Android for a few years, I doubt there is a huge amount of unmet demand for BBM.  

I have seen the app icons disappear from time to time on android phones while the apps are actually still installed. First of all reboot your phone. Then, check to see if your apps are still present. I would use a file explorer, but at least check your “app drawer” on the bottom of your home screen and look for the missing apps.