In regards to the 30 minute penalty;

I think being respectful and asking for a kick is the best method. I think the people that "want you to stay the full time or eat a 30 minute penalty" and substantially more unreasonable than anything else. The 30 minute penalty was made to prevent abuse, but instead it is used to hold hostage anyone that doesn't want to have to put up with an hour+ of wipes on a fight that, really, is very easy.

If someone asks to be kicked, I won't try to hold them hostage if they're polite about it. Hell, I've been in the unsavory position of needing to leave a duty because my FC popped on and said "We need you for X" during my roulette.