Almost.....
Referee certainly wont announce for it to be taken quickly. More wait a reasonable amount of time to see if attacking team wants to take it quick. After a few seconds if it's not taken quickly, move to the point of the foul and show the whistle to indicate that the free kick cant be taken until whistle is blown.
The option to take a quick free kick while attacking goal is no different to a defensive free kick. Onus is on the defensive team to be aware and ready for it. Most keepers wont start setting wall until referee confirms there will be a whistle.






