If the power is out, I compose away from hardware. If not, I mainly compose at the computer.
The piano is part of my compositional process. I use it to improvise melodies and harmonies for my pieces.
I honestly haven't thought of Productivity. Though my composition rate has increased.
Both? The flurry of creative ideas being starting new pieces, often because of a block with another piece closer to being finished and the breaks being with those pieces that I get a composers block with.
A lot of things. Games, playing the piano, helping my mom around the house, knitting, etc.
I haven't thought of having a reward system to be honest. I just keep right on composing.
The dreaded composers block. I do multiple things to try to get unstuck. First, I try to improvise a melody on the piano that goes well with what I have so far. Second, I try to improvise a harmonic progression and write a melody around that. Third, I try to see if the melody I have can be written in a Contrapuntal fashion(i.e. Canon, Fugato, Free Counterpoint etc. and if I'm writing a Theme and Variations type of piece, I go ahead and try to write a Fugue variation of the melody(so not just a Fugato for contrast, but an entire Fugue)) Fourth, if none of these work within a relatively short timeframe, I take a break from that piece and work on a different piece.
I write down the structure I'm thinking of having the piece in and any changes in key. That's it. I save writing the melody and harmony until I get back to my computer.
I'd say a 3, I'm usually pretty relaxed when I compose, but when I get composers block, the tension in me rises.
I do a mixture of methods. It all depends on the type of piece. For something like a Waltz or a Chaconne, or an orchestral piece with a textural creschendo, I do Harmony First. For something like a Sonata or any contrapuntal piece, I do Melody first. And then there are pieces where I germinate the entire piece from motives, a lot like in Beethoven's Fifth, except not using that motive obviously(though sometimes my motives do get close to Beethoven's motives). And then there is the Nocturne, a type of piece that might very well have 1 section written harmony first and another written melody first.