Ok 2nd time posting one of these so play nice! :P
Over the past week I have been able to do the same cooking and fishing dailys for the whole week.
So say on ur server you get Mustard Dogs as your cooking daily you pick it up and complete it and hand it in.
Your fishing daily is Jewel Of the Sewers and you catch/complete it.
Next all you need to do is wait till dailies reset on your server and the second they reset you quickly re pick up the dailies and you will get Mustard Dogs and Jewel of the sewers again.
Now the only problem is you have about 1min after they reset to pick them up as Mustard dogs Jewel of the Sewers otherwise they change to what they are ment to be.