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(Rob) 
I think the setters are there on purpose, since both caption and description for example should be modifiable by the user through a user interface. Unlike the ID, for which there is no setter in the interface.
(Team: Rob's argument is correct)
(Jesper) In 1.4 there was an event mechanism that could be used to propagate warnings from the engine to the OpenMI system (configuration editor etc). Now there is a StatusChanged event, which is much more specific. Being not a super-user of the OpenMI components, is it usefull to have such warnings from the engine in e.g. the configuration editor GUI or elsewhere? In that case maybe there should be a general purpose event on the IBaseLinkableComponent.
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(Jesper) Where does the old EarliestNeededTime go? To the ITimeSpaceComponent.TimeExtent, or to each of the input items time extent?
(Stef) Has to be covered by the input items. See "Managing internal buffers using the consumer's time set" in Section 3.3.5 of the specification document.