as of the shifter, get a short shift kit. theres plenty out there and most them replace all the worn out parts.
oil leak. start by getting a good size cardboard box thatll fit between the front wheels from the radiator to the firewall. top off the oil and let the engine run at idle for 10 minutes. if it drips somewhere the clean cardboard gives you a good reference point. if nothing drips it may be burning oil which means new rings
valve adjustment, yes both are the same gap
key, i had a local locksmith make me a new one, but i would pull/lube the ignition cylinder
carpet, couldnt help you there
a good teflon or graphite spray lubes sticky parts
I know a lot about cars. I can look at a car's headlights and tell you exactly which way it's coming