There is a problem with the following feature: (not the feature itself, I like this feature)
Holding shift while scrolling cycles through block types with the slope block selected.
This also freezes the slot selection to the current slot (IE scrolling does not change slot position)

By spamming the scroll wheel / scrolling very quickly one can cause a 'blip,' and the slot selected will change. This has a chance to apply the "change metadata" command to the resultant slot instead of the previously selected block.

What this does, if exploited, is allow the user to change the metadata of any item between 0 and (I think) 6. While not gamebreaking with this mod alone, if conjunction with Thermal Expansion, for example, one can turn an ordinary strongbox into a creative strongbox and then be able to infinitely dupe any desired item.

Thanks for pointing this out.