I often use @PickList (and its lotusscript cousins) with the [Custom] option.
I would like to present the dialogbox with the current entry (or entries of it's multi-value) already selected, so she/he does not have to start from scratch.
@Prompt has a defaultchoice parameter too.
If you display a categorised view in a picklist-dialog and the user double-clicks a category (especially when it is collapsed), then this category is considered as a "choice" and the whole dialog is closed. (The user has to click exactly on the twistie or use keyboard shortcuts to expand a ...
the ability to have the document id of the selected document(s) returned without having to add a column with the documentID in it would save having to create those workarounds...