A new feature has been added to the forums. Now you can create your favourite smileys list. You can add upto 10 smileys to your list. Your favourite smileys will appear in the smiley drop down menu and the smiley box that appears to the right once you go advanced.

This is how you add your favourite smileys to your list.
Go to UserCp >> Settings & Options >> Edit Favorite Smilies.
Select the smileys that you want in your list and then save the list.

At the moment adding the smileys this way is only possible if you are using the Grey Style Layout.
If you are using any other forum style then this is how you add the smileys to the User CP.

~ Go advanced.
~ On the top right corner you will notice a icon. If you can't find it then look at the image below.
Click image for larger version. 

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~ Click on it. A new window will open with all the smileys. Select your favourite smileys and save the list.

After the smileys have been added they will look like the way they are in the attached image above.