I doubt that there are any 9000 day old posts (X-S isn't that old)..... but many of the older posts contain really useful information about game regions and VGA BIOSes and "the usual places" - as do some of the newer ones.
Modded Xboxes will play games from all regions.
You update the BIOS to give you VGA output by flashing a VGA BIOS, using Evox to do the flashing.
If you want two BIOSes (one normal and one VGA) without opening the Xbox, you have three options:
1. Take the switch from the chip and extend it to the outside of the Xbox.
2. Fit a different chip with an external switch (Xecuter 2.6 or Xecuter 3)
3. Use PBL from your dash to load the BIOS you use least often.
Actually, there may be a 4th option. If your non-VGA TV uses a composite connection, then you should be able to get away with just using a VGA BIOS. When you plug in your VGA cable you should get VGA, when you plug in your original composite cable then the Xbox should revert to standard composite. It should be easy for you to check.