Roadtrip,
Just use an on off switch for the lights, no need to have them work from the radio. Just flip the switch when you want them on and off if you don't. All my planes with lights work that way.

For landing lights a Y harness on the gear channel can be hooked up to an R/C switch or even an on/off switch with a servo on it can be used to turn them on when the gear is down and off when up. No need for a dedicated channel for that.

As for brakes, use 2 proportional valves, a Du-Bro V-tail mixer, some music wire, and 3 wheel collars. Set up the V-tail mixer as normal. Now mount the cylinders for the brakes side by side. Hook the airlines from left cylinder to the left brake and the right to right. Take a piece of music wire and run it from the cylinder through a wheel collar and then through a kwik link in the mixer servo arm. Do this for both the left and right cylinders. Leave about an inch of music wire sticking out past the kwik link so that the servo can rotate and not have the wire come out. Run another piece of music wire from the center post of the mixer, to the rear servo of the mixer set up. Now Y harness the forward servo of the mixer to the rudder and the rear servo to the elevator so that when you push left rudder the left cylinder is operated and of course right works right. When you pull up elevator it will operate both cylinders.

Set the wheel collars on the 3 pieces of music wire so that they will push on the cylinders at about 1/3rd throw. That will give you a dead zone. Almost forgot! Do not use a set screw on the kwik link. It is just used as a wire guide and a surface for the wheel collar to be pushed by. With the proportional valves, the more you push on them the more brake they apply so when taxiing it will add a bit of brake in turns or you can throw the rudder hard over and spin the plane in place. Same goes for landing. Just keep pulling more up as you slow down and the more you pull the more brake action you will get. Works great and looks very scale when taxiing!

Sounds long winded and tough. but it is very easy to do.

Hope that helps out. If not email me and I will try to explain better.
Hans