Best experience for high resolution touch screen laptop?

[Benjamin Smith]

I'm a long time Fedora/KDE fan (since KDE 1.x days) and am just getting 
familiar with my new Dell Precision M3800, and am experiencing a few issues. 

1) You can go "too much resolution", especially when used in conjunction with 
external displays. Default is 3200x1800 which isn't bad when I increase font 
and icon size, but then it looks garish on a "normal" resolution (1080) 
external monitor. Until I upgrade my other displays, I'd like to underdrive my 
screen to 1680x1080 but that resolution doesn't show on the KDE display 
settings dropdown - anything under max res is in 4:3 resolutions. EG: 
1600x1200, etc. 

How would I "assert" 1680x1050? I see this resolution when booted into Windows 
so I know the hardware supports it. (This is the first time in several years 
that Fedora/KDE hasn't "just worked") 

2) KDE with Fedora 21 doesn't seem to multitouch. Is there a way to enable 
this capability? Also, when using multiple screens, the touch goes to the 
wrong screen! (when I touch the touch screen and the mouse appears on the 
external display) 

Is Gnome significantly ahead of KDE in this respect? 

I've posted the output:
http://hal.schoolpathways.com/ben/dmesg.txt
http://hal.schoolpathways.com/ben/xrandr.txt
http://hal.schoolpathways.com/ben/lspci.txt
http://hal.schoolpathways.com/ben/lsmod.txt

Thanks, 

Ben