Magnetic materials retain same physical properties.
A magnetic sword is no better than a blessed sword.
A magnetic screwdriver tip has some use in real life. But in Minecraft, there is nothing like tiny screws handling mishaps.
Even a Minecraft Compass does not use a magnetic iron rod ingredient.
You sure have a point there, but why exactly does a regular Steel Sword has Sharpness II, while a magnetic Steel Sword does not? Or does magnetism prevents it from being sharpened? x-x
Also, what exactly is the point of radioactive tools? Most of them (Excluding Naquadriah for example) have no clear benefits towards other, more common materials, but have the massive drawback of the radioactivity enchantment. While it sure is realistic, nearby entities (Mobs, Animals) should be effected by the radioactivity too, to make it atleast somehow worthwhile, given the requirement of a Hazmat Suit (which doesn't has much durability) to even properly use them.
Is it possible to repair GT 5 Meta tools?
By the way, are there any plans to add Chrome-Vanadium-Steel? It is a more or less common Steel IRL for tools for example. This could also add a bit more use to Vanadium, as its only use so far is for Vanadium-Gallium wires/cables.