Hi B.,
My son, who is now 16, did what I always called the "jungle crawl," never did actually learn to crawl the "right" way, and he has always been a straight A/B student in all subjects. In fact, his WASL scores for reading were above average and always have been. He will be an AP English student next year. My daughters(17 and 9), who crawled normally, are exceptional readers also.
I tried teaching him to crawl the right way, even by getting on my hands and knees and showing him, and it just made him angry when I tried to force him to do it another way. Even his older sister, who's 17 mos. older, tried to show him, and despite the fact he wanted to do everything she did, he wouldn't mimic her in that.
I don't think that there is lot of correlation between type of crawling(or crawling at all) and better reading skills. I think better reading skills are learned through practice, quality time spent reading, first you to your child, and then exchange reading, where you read then they read to you.
Hand/eye coordination can be learned in a variety of ways. Block play, sorting toy play, and puzzles, drawing and coloring, writing, and later, even though you don't want them addicted, video games also teach hand/eye coordination. So, crawling isn't the only way that can be mastered.
By no means am I an expert, I'm just a mom of 3 kids, but like I said, my son never properly crawled, my daughters did, and they are all great readers because it's something we always practiced, stressed, and did together, and because they enjoyed it.
Bottom line, I wouldn't worry if I were you. As long as your baby is on cue developmentally in every other way, he should do fine even if he never crawls.
Have fun with your little man, and enjoy the time he spends on the floor. Pretty soon, he'll be up on his feet and into *everything*! :o)
K. W