I agree with Robusto, I think. There is a semantic difference between "allow" and "allow for". "B did X, allowing Y" implies that by doing X, B directly caused Y to happen. However, "B did X, allowing for Y" implies that doing X may or may not, in fact, actually cause Y; Y may happen with or without X, or Y may require something else to happen besides or in addition to X.
Short non-sequitur, but consider a sentence in the context of carpentry. "He spaced the boards a quarter-inch from the wall, allowing expansion". Those who know carpentry know that you don't "allow" boards to expand; they simply swell and shrink with temperature and humidity regardless of what you do. Instead, you must "allow for" the boards to expand by taking an action ensuring that WHEN they expand, there is no adverse consequence. So, the correct statement, in context, is "He spaced the boards a quarter-inch from the wall, allowing for expansion".
Back to your OP, "a ceasefire allowing talks" implies that talks will not happen without a ceasefire happening first. "A ceasefire allowing for talks" may imply that talks are already happening, or that they could happen regardless of a ceasefire, but that the ceasefire facilitates those talks. Either may be correct, depending on the situation being described.
So, "allow" denotes permission, and thus a direct cause/effect. "Allow for" denotes either facilitation or "proaction" in anticipation of, and thus breaks the direct cause/effect relationship.
Important to signifies a connection to the specified subject (in this case me). Important for denotes importance for a certain cause.
It's important to me! refers to something you value or hold in great esteem.
It's important for me! refers to a cause, e.g. It's important for my health/success etc.
Best Answer
suggests that the date is something the books have.
suggests that the date is something the books receive.
Thus once you have picked the books up from the library, they have a renewal date, and you would speak of it as "the renewal date of the books". However, should you want to borrow them a little longer you may renew the books, thus receiving "a new renewal date for the books".