>>1327347>>1327713Adjusting your saddle to try to fix reach issues is usually a bad idea. Also keep in mind that they do sell extra long seatposts.
>>1327795You're looking at version for racers. LBSes generally offer a basic form of the service as part of the bike buying process, as well as some sort of deal on part swaps needed to fit. It's one of the reasons to use an LBS in the first place.
>>1327720Pic related. It's what happens with Shaq on an off the shelf bike.