With all due respect, if even you make it clear in your own comment that this "issue" will never be resolved, because the creator is busy adding actual content to the game instead of reworking everything they have done so far (which is quite a lot) to match your preferences in particular, then why did you even write the comment in the first place? I just find it silly.
Besides, I think you will find that the current dick works rather well in most (if not all) scenes. It is way above average size, any bigger would just look comical on MC's model. Not that it matters much, the game just look and feels very pleasant, possibly the best experience available on this site (not to mention it is literally free).
If you are discouraged by such a silly detail, I would suggest you to reconsider, you might not just fully comprehend what you would be missing out on. It is not the most unique by any means, but the amount of polish and sheer quality really makes it stand out.