Hey @gmark,
I never use the “Show Actions” sheet anymore – I've used the “Add Action by Name” command @tiffle mentions , since it was first added to KM.
You can also emplace Text-Tokens, Functions, and Variables by name.
See: KM_MenuBar › Edit › Insert <Action, Function, Token, Variable>
You should also be aware of @DanThomas' KMFAM.
Keep in mind too that Insert-Action-By-Name has a help link at the bottom of the dialog that will take you to the Wiki for that particular action.
The insert menus will also do this if you hold down the Option-key.
-Chris