Yes you can use the stuff from that site. We even have 1 PBI for a KDE Theme and 1 PBI for a KDE Window Decore (Love them on my laptop), several people also use setups from that site on their PCBSD

More PBI for that stuff wouldn't hurt the Windows users coming to PCBSD any ether.
BASH, the first shell I liked *memories* Their's a PBI to install BASH but I think it dosn't update /etc/shells (i.e. it dosn't make it ready for you to use it as a login shell). Bash is also availble via Ports and Packages.
Yes ports are fully operational on PCBSD as much as FBSD.
The default shell is like csh or tcsh, hey why dont you give ports a go with installing bash?
(The GUI Way)
KMenu->Computer->PCBSD Settings-> Computer
Click tasks, click fetch ports and take a break depending on your internet and CPU. (At least 15min) You can also type
portsnap fetch && portsnap extract as root in a shell - same thing as above but installs Ports via command line.
Open konqueror and navigate to /usr/ports/shells/bash. Click Tools-> Open Terminal and su to root.
su
password: root password
make install clean
Or
(Shell way)
open konsole or an xterm and type
su
password: your root pass
cd /usr/ports/shells/bash
make install clean
And you should be getting GNU Bash 3.0
You can change it to your default shell via
chsh -s /usr/local/bin/bash
password: your user password
Or by going to KMenu->Computer->PSBSD Settings->Add user and taking a look around.
Also b.t.w. You can update KDE yourself via ports/packages when theirs a new version or wait for a PCBSD Update (which would probably be a matter of weeks instead of days.)