How to create a command that takes args?

I'm building a menu plugin that inserts strings into the document. As far as I can tell (in the absence of docs), I need to create a separate command for every item. Each menu item does something like this, where i is a loop index and t is an array of appropriate strings:

editor.addCommand( 'insertTag_'+i, {
	exec: function( editor ) {
		editor.insertHtml( t[1] );
	}
});

Then each menuItem gets assigned this command with:

command: 'insertTag_'+i,

as part of its definition. This seems inefficient, but since the name of the command is passed as a string I don't see how I can pass params into it so all menu items can call the same command with different params.

Alternatively, can the command element contain a closure that achieves the same thing as the command?

This is all somewhat academic since I can't figure out how to make a menu appear in the first place as the docs are a bit sparse.