Go to the Hebrew. It doesn’t say that God can do what ever He wants. It says that He does what pleases Him.
It is not in contradiction with the Scripture that says that God cannot lie or change.
http://bible.cc/psalms/115-3.htm
New International Version (©1984)
Our God is in heaven; he does whatever pleases him.
New Living Translation (©2007)
Our God is in the heavens, and he does as he wishes.
English Standard Version (©2001)
Our God is in the heavens; he does all that he pleases.
New American Standard Bible (©1995)
But our God is in the heavens; He does whatever He pleases.
GOD’S WORD® Translation (©1995)
Our God is in heaven. He does whatever he wants.
King James Bible
But our God is in the heavens: he hath done whatsoever he hath pleased.
American King James Version
But our God is in the heavens: he has done whatever he has pleased.
American Standard Version
But our God is in the heavens: He hath done whatsoever he pleased.
Bible in Basic English
But our God is in heaven: he has done whatever was pleasing to him.
Douay-Rheims Bible
But our God is in heaven: he hath done all things whatsoever he would.
Darby Bible Translation
But our God is in the heavens: he hath done whatsoever he pleased.
English Revised Version
But our God is in the heavens: he hath done whatsoever he pleased.
Webster’s Bible Translation
But our God is in the heavens: he hath done whatever he pleased.
World English Bible
But our God is in the heavens. He does whatever he pleases.
Young’s Literal Translation
And our God is in the heavens, All that He hath pleased He hath done.
http://biblos.com/psalms/115-3.htm
Hebrew Transliteration Strong’s English
ve·lo·hei·nu 430 our God
va·sha·ma·yim; 8064 the heavens
kol 3605 all manner
a·sher- 834 he
cha·fetz 2654 pleases
a·sah. 6213 does
Okay. So your contention is that God does whatever pleases Him but He can't do whatever pleases him. He does it, He just can't do it.
If that's what you want to argue, don't let me stand in your way.
THX THX
It seems some can swallow whole camels, but then they strain at gnats.