quest is very powerful, it can be done, but just because soemthing is poweful, doesn't mean that it ca be made easy to do it, regardless of the software/engine, and quest IS one of the best out there too, making it as easy as possible, but some things just can't be made easy.
maybe it can be done... I'm only a noob, so wait for the more knowledgeable people, like Jay or Pixie, as they might be able to help you in doing this in an easy way (or if difficult they can help you through it).
as far as I understand, since the 'objects and places' (or whatever it is called, lol) pane on the right, uses Objects, the problem is in the Objects themselves. As the Object, is an Object (that you can click on as a button), and then the 'Verbs', are actually Script Attributes of a (that) specific Object, and thus are a 2nd clickable, as a (sub) button. So, to have you to be able to click on an Object and it does a Verb, means first and foremost, you'd have to have only one Verb or providing a selection of which Verb to execute anyways, and 2nd of all, you have to re-code the underlying code for it to bypass the Object as a clickable button, going straight to its Verb activation (and bypassing the Verb/s as clickable sub buttons of that Object).
thus, quest has other means of achieving this effect, via using Commands and/or the hyperlinks in/as the text in the big text box left pane.