Alrighty, lets get into this
Idea 1: Server rentals.
This could probably work out, but I'm not a developer, so I don't really have an 'authoritative" opinion on the matter. Renting servers could be really fun for a group of people, although, it would have to cost more if implemented, seeing as there'd be basically 3 dedicated servers for renting, which is believe it or not, very expensive on MCSG's behalf.
Overall, it would be cool, but expensive, and very impractical.
3/10 practicality points, sorry >.<
Idea 2: Ender Pearls in chests.
Easy enough to implement, but, I think many people would disagree with wanting to add them. Why? As you mentioned, chases would be much easier, but in all actuality, they'd be harder for the runner, and sometimes even the person hunting them down.
As you may know, Enderpearls aren't the most accurate way of transportation in minecraft, and can easily get you further behind a runner. In my opinion, these can disadvantage you a lot more than they advantage you.
Overall, I wouldn't mind them being added, but they'd be very annoying and make MCSG a lot less of a representative of the "running strategy".
6/10 practicality points.
Idea 3: Some snazzy new sponsor items.
I really hate downing your ideas, but unfortunately, I really don't see most of your listen sponsor item suggestions working out. Potions were attempted,( be it not the one you suggested), and kind of failed. They were replaced soon after, and more than likely will not be added back, this going for any representative of the 'potion group'.
The leather helmet is alright, but for the protection they provide you, it's like sending someone an eggshell
. It'd honestly be a silly addition. It wouldn't hurt, but in my opinion, there's better things to be added.
Golden apples. Assuming you don't mean God Apples, I actually wouldn't mind this being added. It's a definite way to help a friend in need out, and for a high price point, shouldn't end up being to over-powered.
Overall, I'd possibly like to see some new sponsor items, but unfortunately, your suggestions are not to my taste.
4/10 practicality points.
**Really sorry if I sounded harsh. I went over this a few times to make sure I didn't, but if I did, please don't take offense. I tried to answer as honestly as possible, not hurt your feelings
**