[Al Skierkiewicz]

OK, Al goes out on limb...
Disassembling robot electrical components is a violation of the rules. Your inspector will ask you this question during the inspection process. R60 is very clear in what it includes, battery chargers included. There is a good thought process behind this. For robot components like the motors and servos, modifying them can/will give teams an advantage due to a change in power output or power curves. The same logic can be applied to modifying speed controllers with low resistance FETs, spikes with higher current relay contacts, etc. The modifications as listed and the exceptions as listed all are designed to minimize advantage and insure safety as designed. In the case of the battery chargers, should one of these devices be allowed to be opened by anyone that is not authorized, serious injury can result. First simply cannot make a blanket policy that covers all those possibilities and keep everyone safe.
Marshall, the servos cannot be modified simply by adding a resistor. They are feedback controlled positional devices with an active motor driver and feedback mechanism internal to the device. Although modification kits are available for specific purposes, we cannot inspect the internal mechanism for each and every robot. Therefore, modification is verboten.
For some of the other reasons, the intent is to prevent you from shooting yourself in the foot. In the case of a speed controller for instance. Maybe you are perfectly able to change out a FET but generally they are not the only devices that have been damaged. You change out the FET and assume everything is OK. When you get onto the field, you find your robot has turned into a flaming inferno, threatening the venue and other robots not to mention any human that happens to be close.
As to the Crio gasket, this is a well thought out procedure to help protect an expensive control component. If followed to the letter, anyone can make the change without fear that disaster will result. In fact if used, you will likely experience a much lower failure rate in competition. This is due to metal flakes your team was not careful enough to prevent falling into the most expensive component on your robot. I can tell you it happens, I have removed buckets of debris over the past two years from teams who thought they did a good job of covering stuff. The Crio is built like a tank but it is not bulletproof!
While some teams mentorship excels in a particular area, all teams do not have access to that level of experience. To allow those teams to use their talents unrestricted is an unfair advantage.
For the rules that don't seem to fit any of the above, consider those to be simulated real world restrictions. The GDC does want to you to think after all. A good way to do that is to make fake physical limitations, i.e. size, expandability, battery type, weight, motor type and numbers.
If anyone thinks that there are not teams that push the envelope, do things that violate the rules or shoot themselves in the foot, you need to walk around with a UL safety advisor or inspector for a few hours. I have stories that will turn your hair gray.