I had installed the Fedora 12 via external DVD driver, I hadn't faced any problem during the installation. However, Fedora freezes on the first boot. I can make it boot by disabling ACPI in Grub.
At Grub prompt press 'e' to edit the command before booting, then select the second line and again press 'e' to edit selected command. Type acpi=off at the end of the command, press 'b' to start the boot procedure.
After I successfully boot up the Fedora, I updated the system. Unfortunately, the ACPI problem hasn't been solved by updates. I added acpi=off to the grub.conf file under /boot/grub/grub.conf to make it permanent (run grub-install after editing grub.conf file, like grub-install /dev/sda). Disabling ACPI isn't very good idea, especially in a laptop. As I found on the net, Ubuntu works fine when acpi=on. I am going to try finding better Fedora solution later. I think it is enough to get it work today.
The wireless adapter driver isn't supported on default. You need to get it from Realtek website and build it (to install compiler and other development packages as prerequisite). The RTL8192SE driver works well in my system, even wireless adapter is reported as 8172 in lspci output.
Finally, I typed the commands to getting the scroll button work as follows;
> yum install gpointing-device-settings.i686 > gpointing-device-settings
- Select TPPS/2 IBM TrackPoint, check "Use wheel emulation" and set 2 as button value (not permanent!).
Note: After I wrote the explanation above, I found another way to run Fedora on x100e. I patched and compiled the kernel. I run the Fedora without acpi=off now. I sent the patch to other two users and they reported that it works fine on their x100e as well. Please write me if you need the patch.