I very much dislike the automatic select all checkbox being on by default.  I would rather place my individual models and then peform the select all when I am done for any shared alterations.  I can manually uncheck it but if I do anything after that point such as delete one of the models the select all checkbox reselects itself.  If there is a way to achieve this that I haven't found please let me know because this is frustrating coming from a different slicer where this isn't an issue.