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After digging around some more I found more hidden INI keys. Again, use these at your own risk. whileLoopSharedCloneOptions=True - adds an additional context menu option to the While loop; not sure what the different options do GenericsAreGo=True - enables the creation of generic VI's (danger!) by right-clicking a control or indicator and selecting "Generic" ActiveXMoreContainerOptions=True - Adds "Persist State To Edit Mode" and "Destroy And Recreate When Run" to the Advanced submenu of an ActiveX container AdvancedPlotLegendMenu=True - Adds a whole bunch of additional options to the context menu for a plot legend EnableStrictTypedefConstantConfiguration=True - Adds a new context menu item to constants based on strict typedefs called Act as Strict Typedef Constant. Function unknown. enableSecretPopups=True - Adds additional context menu items to custom control parts that configure how they scale with the control. Apparently some other hidden menu items are added somewhere too. (Thanks, hooovahh and Christina Rogers!) showRunAtAnyLoopMenuItem=True - Adds a new menu item to Property and Invoke nodes labeled "Run At Any Loop". When selected, the node turns brown as if a private property or method was selected, even if none are. Function unknown. ShowWireAddressMode=True - Adds some additional memory-related information to the context help window when you hover over a wire. Also adds a context menu item to wires called Select InPlace Signals, which likely selects wires that share a memory address. Seems like it could actually be pretty useful for optimization! SimShowCompanionDiag=True - Adds a context menu option to the Simulation structure called "Show Companion Diagram", which toggles showing what looks like a "behind-the-scenes" block diagram for the simulation. NEW! ShowHiddenLibraryItems=True - Shows hidden library items. (big surprise there!) So far I've only seen changes when editing a statechart library, but it seems most of the items in a statechart library are hidden, so it reveals a lot. There's also some more whose functions I'm not sure of (but look interesting) such as TotallySecretAndPrivateMSNCompanionDiagram, and growSubVI.enabled (might be pretty mundane, but it's false by default and might have something to do with creating subVI's that can grow like XNodes.) If I find any more interesting ones I'll post them here, but here's a list of every INI key loaded when LabVIEW starts, obtained by hooking the internal function that reads them: http://pastebin.com/j1iAEZXg. See here for information on finding the rest. In the meantime, if anyone knows what any of these do, please post!

enableSecretPopups - I put this token into LabVIEW 2011 for Silver control development, as a quick-and-dirty way to make low-level control edits. I've been giving it out to people on a very limited basis, but I guess since it's out here I'll widen the audience. I show a screenshot of the new menu items in https://decibel.ni.com/content/docs/DOC-17431 Once this token is enabled, you'll be able to see the settings on parts of the Silver controls to get an idea what they do. eg "Left Move" means the part will move left when its "master" part changes size via moving its left edge. "Left Grow" means the part will scale in that situation. Setting both the left and right move options will make the part stay centered. There are clearly combinations that don't make any sense and I suspect LabVIEW will behave badly if you use them. I recommend that you disable the token when you're not using the Control Editor, because it also enables other menu items that are not ready for prime time and you might use them later without realizing they're only there because of this INI token.

Over the past few years, I have advocated that several private properties/methods that could be useful to the wider LabVIEW audience be made public/scripting. I have been largely successful. Please let me know (on this thread, or with PMs, or whatever) if y'all come across private entries that you think would be useful, and I'll see what I can do to make them official in a future LabVIEW version.