by the looks of it i wouldn't even worry about that. but if it's bugging you that bad......
i sometimes can get warps out by placing a towel on a rounded rail (like a brunswick anniversary, and not on the rubber side either. take your cue and sight down it to determine the direction and beginning part of the warp, mark it with a pencil, then take the shaft and while bowing it on the table against the direction of the warp, work the shaft back and forth lengthwise, starting from the thickest end of the shaft to the thinner but don't go past the point where your shaft runs straight. this takes a lot of practice and touch to be able to get it right. the idea is, that if the wood was cut properly and the shaft was stable for a long time, and the warp developed out of a change in storage conditions, there's a good chance that the wood will want to revert back to it's original shape, but needs a little help.
i did this on rack cues while working at a poolhall for 5 years, probably was successful most of the time in getting cues to go straight again. be careful though if you try, you've got to be patient and accurate when bending the shaft back against itself or else you could warp it in more than one direction.
i'm sure you should be able to find someone else who's done it before, but if you want to attempt it yourself, i'd advise trying it on some house cues first.
p.s. i try not to check the straightness of a cue by rolling it on a pool table, i do it by sighting down the shaft like a rifle. if i do roll it, i'll do it on multiple tables in different directions.