No, hardware requirements for a listed Fire Door would not allow the use of the Touch Sense Bar.
Yes, the Touch Sense Bar is an excellent choice for initiating an Exit Delay System on non-fire rated doors.
As long as your door does not exceed 48" you can order the standard bar that is longer than you need and cut it down in the field to the exact dimension required for your installation.
No, but you can easily and inexpensively have them powder coated to almost any finish required.
No, not necessarily. They do require a linear power source. They will not operate properly on a switching power source. There are several power supplies used in our industry that are switchers. (Contact tech support at Securitron if you're not sure) All of Securitron's power supplies are linear.