Currently, when you double-click on a subcomposition node, the subcomposition opens in a new window. This feature request would add an alternative way of opening the subcomposition. When opened this way, the subcomposition would be embedded within the original composition. You would still see the subcomposition node in the context of the original composition, but it would be enlarged / X-rayed so you could also see the contents of the subcomposition.
Not sure if this belongs in the Vuo SDK category, but a node that records/displays the execution time of a node/nodes could come in handy. This to check own custom code nodes, subcompositions or part of a composition. Maybe something like this:
With nested if-then-else expressions and the like the Calculate node expression text quickly overflows beyond the field of view. Either allow the input to accept string expressions (from say the Shared Value node which has a slightly large field for text entry) or just make the field expand when more text is added.