So last week I went for the interview of my life and I absolutely excelled. I answered all questions with ease and presented confidently and showed a real enthusiasm for the job. There were 6 questions. All marked out of 6. I got 32 out of 36 so a very high score.
But after 7 failed interviews where I came a close second, I just know another candidate will have come in and done even better. There's 4 positions going and 10 people interviewed.
So it was very clear from the interviewers body language that they really liked me. All huge smiles and learning in/making strong eye contact. They spent a lot of time selling me on the company and talking hypothetically as if I was in the job 'you will be able to do xxxx training and we're going to be moving to xxx building and I know you know your way around there very well as you worked there previously'. Finally she kept reiterating how several candidates 'dropped out' of the hiring process. I think she wanted to give me hope I would be selected as I know this isn't really true. There were 600 applications for 4 positions and 10 people were shortlisted. They have a reserve list of candidates they interview if anyone drops out and I know two friends who also interviewed.
I know I did well. Therefore when the inevitable rejection call comes 'you did a very good interview but the competition was particularly high' I'm wondering if it would be unreasonable for me to express how interested I am in working for the company in the future and if there are any fixed term or agency positions to keep me in min for them? I feel really cheeky doing that but feel it's my only way now of getting my foot in the door.
Also, is there anything I can do after receiving the rejection to reiterate how interested I am in the job and company (it's my dream job) without sounding batshit? 
They are making the decision on Wednesday after they have interviewed the final two candidates.