I'm not sure about soaps on Sunday nights though, but I agree with freeing Friday up. I would do what Channel 7 in Australia do with Home & Away, and have an hour-long editions of both soaps in the week (H&A's is on Thursdays) freeing Friday up for a more weekend feel like you say. I'd also run both Corrie and Emmerdale at a strict 5 episodes a week. Corrie's double could be on Monday, and Emmerdale's could be on Thursdays.
I don't know why they stopped doing the soaps on Sunday, they were a real banker for the channel and a staple of the schedules, and without them, yeah, they do alright when The X Factor is there but at other times of the year Sunday nights plummet to real lows because there's nothing to drive viewers there.
In fact since 2000 there's only been one extra Corrie and Emmerdale each a week but it looks like there's been far, far more, because the scheduling is so bad and you get traffic jams of soaps on some nights and then on others, nothing at all. So on Monday and Friday you get ninety minutes of it, limiting anything else you can do that night, whereas on Tuesdays after Emmerdale and on Sundays that's it and the night is totally barren. I don't like two episodes on a night, I think it becomes a bit of a chore for the audience and it makes the scheduling confusing and viewers forget when they're on. For Emmerdale, "Sunday to Friday at seven" is far more elegant and easier to remember than "Monday to Friday at seven and also Thursdays at eight".
Also, artistically I dunno how it works because what do you do when an episode is really special and you want to make a splash? With 'stEnders you know it's a big day when there are two episodes in a night or an hour-long episode, but Corrie and Emmerdale do that every week, so how do big episodes stand out in the schedule?
I would scrap the sixth episode of Emmerdale, they only do it because they can. I know it's all about economies of scale and the more they make the cheaper it is, but five episodes a week is still a hell of a lot. It hardly does much on Thursdays at eight anyway, BBC1 are happily showing Watchdog against it and getting a decent audience, it's not doing much to dent BBC1 so what's the point?
If we have to have six Emmerdales, I would take the Thursday 8pm Emmerdale and the Friday 8.30 Corrie and move them to Sundays at seven and 7.30 respectively. That would free up two midweek slots that would make the schedules look more varied, and Sundays are OK because you still have plenty of the evening for other shows, unlike Mondays and Fridays where after you've had all the soaps you only have an hour to play with and then it's the news and bedtime. I know you've got Strictly on Sundays but that would at least annoy BBC1, in a way the Thursday 8pm Emmerdale isn't really.