It such methods like constructors are not displayed in method browser it is not possible. I think it may be because of amount of constructor executions (sometimes). This may be reason of overhead in some circumstances.
The same situation is with System.* methods. I’ve made Appmon sensors on such guys, I cannot to it in Dynatrace (because of the same reason I suppose). About plans for the future we will have to wait for someone from DT team 🙂