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In a form I have a selection-list where the user can select certain options, lets say a user is filling the form but the option he needs is not in the selection-list so there is a checkbox called 'other' and when the user marks it I show up a text-field where the user can fill with his option, now what I need is to add that option into the selection-list so it can be available in the selection-list next time, is that possible?
Yes, you just need to store the values in a config doc (see http://www.plomino.net/how-to/configuration-documents ).
If you do so, it is very easy to add an extra value in the list whenever you need.
Be careful, it implies all the users able to create a new doc are authors of the config doc, you can do using the Plomino_Authors field.