You can try to install "Extract And Compress KDE4 Service Menu" to have a context menu to compress and extract files and folders.

These are the steps:

1) Open a Terminal and install these packages.

• sudo apt-get install dolphin kdebase-bin kdesudo rar unrar p7zip-full

2) Create a soft link to kdesu in /usr/bin , which is necessary for the script to install the service.

• sudo ln -s /usr/lib/kde4/libexec/kdesu-distrib/kdesu /usr/bin/kdesu

3) Open Dolphin and go to Configure Dolphin > Services > Download New Services

4) Search for "Extract" and "order by" Most downloads. Then click on Install button to download the service to your machine.

5) Open a Terminal window to install this service.

cd ~/.kde/share/apps/servicemenu-download/

tar xvzf 84206-ExtractAndCompress_v1.4.4.tar.gz

cd ExtractAndCompress_v1.4.4/

./install.sh

6) During the installation choose systemwide (requiere root password)

7) Put your root password and when you have to select a path choose /usr/share/kde4/services

8) To finish...Logout and Login, open a Dolphin window and when you click a file o folder you should have a context menu to compress.
eg: Videos folder

hope it will be useful.