For a start I would like these:
1) I would like no evictions or nominations for at least two weeks. It gives us more time to judge. I am suprised they've never done this. Not having enough weeks in the series is a very poor excuse not to try it. There's enough time with an occasional midweek or double eviction.
2) If one group/gang is clearly dominating by block voting, then I would like to see BB use save and replace or something similar but only if necessary to help stop a series from becoming boring.
3) The three people or more with the most votes instead of two are up for eviction. I've lost count the number of times boring housemates have avoided been up for eviction by just one vote and it never gets any less annoying.
The downside is there would be no more head to heads, but they're overrated imo.
4) If any housemate tells Big Brother they want to leave, they must be given a final warning that if they ask again another day, then they will be evicted immediately with no goodbyes.
Also, if they try to breakout like John James BB11, then they will be asked to leave immediately without any warning.
5) No contact with the outside world and nobody in the house but housemates, not for tasks not for anything. I do not want to see any celebrities or anyone popping in for a chat and a cuppa.
6) I want the tasks to be much harder and more 24 hour tasks, like they used to do.
7) I want at least two evictions a series that are cruel and a genuine suprise to the housemates.
8) Get rid of the name tags and the overuse of spoonfeeding flashbacks. It's insulting to most BB fans, We aren't idiots we remember things.
9) Live Feed obviously or at the very least a few hours of extended recorded footage on top of the main show.
10) I want an intelligent and more serious alternative to BOTS/BBBM. Something with real fans of the show like people on Tibb that know what they're actually talking about. It could be made in a similar way to "Question Time" or "Newsnight Review".
11) At least twice a series, the whole house should be up for eviction.
12) Better secret tasks for housemates with more interesting rewards. Both are usually abysmal.
13) Various ages of housemates, but not too old that the others feel like they have to feel sorry/take care of them.
14) New housemates roughly half way though the series but not the odd one. It's much more exciting imo if they throw five in together, like BB10.
15) I say it every year, but a more interesting mix of different people.