Cannot enter whole measure rest as such
This is a perhaps a border case between the bug and the feature request concepts, but I think it is worth reporting anyway.
*) Semibreve (4/4) rests can be entered as semibreve (by selecting the proper duration with ) and behave accordingly.
*) Whole-measure rests cannot be entered as such; the usual work-around is to select the whole measure and delete everything. However, this is not possible if the whole-measure rest is needed in a voice other than 1. See this post for a fairly common use case.
Suggestions are welcome.