IMS Learning Design is considered by many authors the "de facto" standard in educational modeling languages. The versatility of the framework enables its use in very different situations. However, such versatile framework is usually hidden by its complex management. One handicap identified in practical experiences is the lack of flexibility of scripted courses during the enactment phase. The activity sequence and learning resources are rigidly defined during authoring. This fact makes difficult to react to unexpected events that may happen in live courses. Also, this rigidness does not allow instructors to give "their personal touch" to courses. This paper presents the improvements made on GRAIL - an IMS LD compliant player-aimed at the support of a flexible enactment phase. Two types of modifications are considered: the modification of the learning flow and the management of course content with a wiki engine. Finally, this paper discusses how the integration of third party services in the activity sequence relaxes the rigidness of scripted learning flows. Experiences deployed in real scenarios allowed analyzing how such integration offered flexibility in practical situations.