Hello Eric,
Thank you for your feedback. StarUML try to keep compliance with UML standard specification. According to UML specification, association is allowed to be connected only with classifiers (e.g. Classes, Interfaces, Signals, Enumerations, ...), but now allowed to be connected with non-classifiers (Packages, Shapes, ...).
We understand that sometimes connecting any two elements (event it is invalid) is useful to represent something you intended. So, we will consider to provide a line-style linking (not association) between any two elements.
Thanks,
StarUML Team
2016년 8월 29일 월요일 오전 11시 18분 18초 UTC+9, Eric Duncan 님의 말: