The forum went down the moment I attempted to respond but here's more or less what I wrote.
I took some time to review some of the possible "abuses". All of them rely on the DM either not knowing how the item works, or the DM allowing you to get away with shenanigans with the item. There are a few reasonable uses mentioned, such as blocking up a heavy door or stopping a fast-moving object, which are clearly "intended uses" not abuses. There are others that are clearly abuses, but they rely on an abuse of the rules, not an abuse of the item, such as being swallowed by a dragon and activating the item. When you are swallowed you are considered Restrained, meaning you can take no Actions. It is an Action to activate the rod, therefore you cannot do this. Others rely on heavy abuse of the concept of "Restrained". You may be able to pin a man down with a Rod, but the Rod does nothing to impair his limbs or other body parts, unless you sit there and bat away his hands he can simply turn the Rod off. Infinite ladder? You need 3, not two. One to stand on while you climb up the others, because otherwise it's more like infinite Monkey Bars, and that calls for Endurance checks because you can't hang from your arms for forever. Not to mention half the suggestions require modding the rod, or activating it from range. The first is easy to resolve: it's a magic item, don't allow modifications, that's where the 3.X crafting system was broken. The second is less easy to resolve, since you could potentially activate it with a mage-hand, but otherwise it's not remote-controlled. You have to push a physical button on the Rod itsself.
So quite frankly I'm just not seeing the terror in two immovable rods.