When I can't get my story to move forward (usually because I am writing a chapter from the wrong POV -- point of view -- and I haven't yet noticed that or because there are other people in the house making noise), I work on setting up my technology for the most efficient use of the wee writing windows I do have.
I do all the actual writing in Scrivener on my big home computer. My arthritic fingers insist on its ergonomically correct keyboard and there is no way around this. But I can't and really don't want to run to my desk whenever I get a thought.
I just use the voice memo function on my phone to capture stray brilliant inspirations (rare) and/or crippling plot errors I just now realized (more common than I wish). Then when I do get to the computer I listen to the memos and add to my running Manuscript ToDo list.
Another big happy discovery was Scriviner's ability to publish to iBooks. I really dislike printing to paper as it is wasteful and cumbersome, but there are times that I really just want to read the story, or just that delicious chapter that fell from my fingertips last night, and I want to read somewhere other than my desk.
I figured out how to send my work-in-progress to iBooks which lets it look just like a real book that I can read on my phone or my iPad. As I read, if I find places to edit, I can make a note right in the book and then at the end of my session, I can email my notes, sorted in order of chapter, back to myself. This gives me an ordered list of edits to make when I am next at my big computer.