Goal modeling is an important part of various types of activities such as requirements engineering, business management, and compliance assessment. The Goal-oriented Requirement Language is a standard and mature goal modeling language supported by the jUCMNav tool. However, recent applications of GRL to a regulatory context highlighted several analysis issues and limitations whose resolutions are urgent, and also likely applicable to other languages and tools. This paper investigates issues related to the computation of strategy and model differences, the management of complexity and uncertainty, sensitivity analysis, and various domain-specific considerations. For each, a solution is proposed, implemented in jUCMNav, and illustrated through simple examples. These solutions greatly increase the analysis capabilities of GRL and jUCMNav in order to handle real problems.