how to set up media keys for audacity?

[Justin Anthony]

So I just had linux installed a week ago at the installfest and told 
myself that I wouldn't ask any questions until a week later to give 
myself the time to figure it out myself.  Unfortunately, I couldn't 
figure out these three things.
(BTW, I have a dell precision m90 with Gusty Gibbons ubuntu.

1: How can I get my media keys to control the songs playing Audacity? I 
saw some tutorials referring to editing linebkd.def from lineakd but I 
couldn't find the .def file.  I used synaptic manager to install lineakd. 

2: In windows, the drivers for my touchpad include being able to set it 
up so that when I tap in a corner of the pad, it performs a command like 
"alt+f4" or something.  Is there a way to set this up on linux?

3: I have both, kde and gnome, installed but I can't connect to my 
wireless internet on kde.  I open the wireless network manager and it 
can see my wireless signal but it won't give me the option to connect.  
Is there something I'm forgetting to do or do I just not know what am 
I'm doing?(That's a bit of an obvious answer, but hey, that's what this 
list is for right?)

I would like to say thanks in advance because I know you guys are going 
to give a great, thorough response.  This list is honestly the tipping 
point as to my procrastination in installing linux.