Yes you can use the Properties tab to do this
Consider the following string:
&os=Operating System;string;linux
The above can be considered as a single input variable. The & sign is used to separate multiple variable while the = sign is used to assign the variable it?s description, data type and default value. With this knowledge we could read the about as:
&name = Description;datatype;value
where:
name ? name of the variable to be used inside theplugin code
description ? A brief description of the input variable
datatype ? the type of input to accept from the user
value ? the values or list to be displayed.
Where data types can be one of the following:
int ? An integer. Use a textbox to accept numeric inputs
string ? This is the default data type. Uses a textbox to accept input values
list ? A list. Use a dropdown menu to display a list of values.
Example of a list input variable:
&color=Colors;list;Red,Blue,Green
Note: future versions will support more data types such as date, color, etc
See also "Creating a Plugin - The Developer’s Guide, page 9"