There's no okey-dokey, but there's plenty of precedent:

"A panel of legal scholars and lawyers assembled by the American Bar Association is sharply criticizing the use of "signing statements" by President Bush that assert his right to ignore or not enforce laws passed by Congress."
http://www.washingtonpost.com/wp-dyn/content/article/2006/07/23/AR2006072300511.html

"With pressure mounting to extend next Monday's enrollment deadline for the Medicare prescription-drug benefit, the Bush administration took another small step in that direction Tuesday, waiving penalty fees [through executive order] for very low-income seniors and people with disabilities who sign up late."
http://www.huffingtonpost.com/2014/02/14/obamacare-medicare_n_4788731.html

"The Reagan Administration sometimes used administrative delays as a device to enforce its philosophy of less government and to save money..."
http://www.nytimes.com/1991/03/31/us/us-...=all&src=pm