How can I create custom Fields like Search?

Is it possible to define a custom field for use in a toolbar instead of having to launch a dialog (dlg)?

For example, instead of the Example From Dopus as shown below, I want to define a custom field with similar info, and then call a custom JScript using the info entered by the user.

Field Editor - Directory Opus
dopus_FieldEditor

Appearance in Lister Toolbar as defined by above Field Editor.
dopus-search

Use Case
Enter info directly into a toolbar input field, and when enter is pressed, pass input data (along with any other arguments) to a custom jscript.

You can use FAYT Scripts for that:

Can't currently create separate/individual fields for them on toolbars.