ManTimeForgot
Temporally Challenged
In either being able to have power over the choices you make in the future you would have to not know what the answer is. At best omnipotence would give someone the ability to actually experience every possible choice but at the same time omniscience should give what the final answer is even with all the interventions considered. In short you can't know your future and expect to have any control over it, one of the omnis needs to go.
You are still thinking like a linear, unipresent being. This restriction is voided for an omnipotent being. I am actually not convinced that omnipresence, omniscience, or any other "omni" is not in some was an ancillary characteristic of omnipotence.
If I am omnipresent both spatially and temporally, then I have not lost any faculty of decision making (not that I think decision making can be anything but conserved for a being which has perfect decision making capabilities; if it was a perfect decision then it will always be perfect no matter what changes since your omniscient self predicted everything that would happen in the interim) because I am equally present in past, present, and future simultaneously. The notion of "time" loses any and all meaning for this being.
This actually goes back to a thread I tried to start up a while back http://www.religiousforums.com/forum/theological-concepts/82272-immunity-contradiction.html I am not unconvinced that our misconceptions about omnipotence (and the other omnis) are largely anything other than a failure of imagination. We are being asked to properly conceive of something which is wholly infinite in some way (which includes whatever consequences this faculty has), and this just isn't possible for one infinity let alone several in conjunction.
Transposition, multiformity (I can adopt multiple forms simultaneously), multi-compositionality (I can possess multiple distinct compositions simultaneously) multi-location (I exist definitively in multiple places simultaneously), paralocation (I have no definite location), and the list just goes on and on. Some of the above might seem contradictory, but those are predicated on hidden assumptions of our own. Introduce retrocausality (future causing the past) and suddenly transposition doesn't seem contradictory. Introduce timelessness and multi-location and paralocation don't seem contradictory. Multi-location allows for multiple forms and multiple compositions without seeming contradictory.
And that is all just off the top of my head.
MTF