When working on a front panel you can drop a typeless array and add or remove data types from it. If the array isn't typed, the vi won't compile. (Broken run arrow.)
I'd like to see this behavior extended to other constructs that contain type information: queues, notifiers, user events, and DVRs come to mind immediately but there may be others. For me the lack of this ability is most noticable when I'm creating new classes. I'll be trying to set up the class definition (.ctl) but if it contains any of those data types I have to open a block diagram, drop the create prim, and create a control on the output terminal. It's inconvenient to have to do this with any vi, but moreso with ctl files since they don't have a block diagram associated with them.
