Hey dan,
The events I've ran have been largely conflict free we have a relaxed club. But Vince is right, people design lists in different ways, I didn't really cater for this in any of the 4 tournament/leagues I've ran. I didn't receive a complaint to my face, but I think it has left to reputations at the club. Good or bad, it is what it is.
7th is a challenge. I'm yet to see a tournament that's not comped out, lords of war (sorry Logan, ghaz and likely Draigo) it's easier to blanket ban, unbound is a no no, some don't like large warp charge pools but I don't see the need to limit, detachments are fun, usually 1 primary and 1 of the rest (bar LoW), some even stopping Knights codex, Maelstrom missions, regular missions, comped maelstrom missions or mix of both.
One of two issues I had was drop outs, it's a pain, but it happens, life happens, but you'll need a plan. Second was getting people to play lol, people lose interest if their list doesn't work and fluff players don't really want to get smashed by competitive players so games get delayed or people play a lot of different games at the club so rarely do leagues, tournaments run to schedule.
Time limits are a good idea, but what are the consequences of not meeting them?
As long as your clear before the start then it's allll good.
I always wrote a small rules pack and kept the pms flowing as well as the forum.
Although i won't be here much longer in person, if you need a hand with any thing I will be active on the forum
Rob