1. Sounds like I'm probably ok with just the chain tool on my multitool...even if carrying a spare link or connected might make the job easier, since I would only riding the bike less than 10 miles on the repaired chain...i can avoid the big ring that long.
2. I have not altered my chain length at all other than infrequent Lube...it came with the bike...I assumed it was the right length.
3. I am running 21 speeds (3&7) on a hybrid. I rarely use the big ring anyway.
4. I wont be carrying gloves with me other than cycling gloves (or in the current season, realm warm non-cycling gloves...thats why I wear black shorts/pants...to wipe my hands on.