Simulink Quick Insert - Setting a specific block parameters

When using the Simulink Quick Insert for a block (click on workspace, type the block name) certain blocks will pop up a text entry field to allow a specific parameter to be edited. For example the Gain block will allow you to get the gain parameter.

For custom blocks, is there a way to specify which parameter is available to the user to edit? So if a block has two mask parameters, it will allow editing of parameter 2 rather than parameter 1?

Also is there a way to disable this text entry field for blocks?