Quite possibly this is something to do with how your tablet renders the page. A slightly larger font than default can squeeze the layout and the link will disappear.
I'll note a more adaptive layout for the next design tweaks we do.
The ability to delete your threads
Not going to happen. Contact the admin if you think your thread needs to be deleted. We have Google SEO stuff to consider.
maybe make a rule that Competition entries should be based on activity over a monthly period, because a certain troll is only active during a week of big competitions, then he suddenly has the highest activity (or in his case Trolling Rate) after the competitions are over then he is nowhere to be seen and activity back to 1% daily
I can consider activity competitions that run over a longer period; I'll give it some thought on if it fits with our strategy.
And perhaps makes posts in the TK not count?
Can't exclude individual threads. I'd have to exclude the whole Off Topic forum. Plus, why should TK be excluded from the overall activity. It's very much a cornerstone of the forum community.
Allow users that have blocked other users not to have to see their posts, even when quoted on.
[Example: User posts and User is blocked by me. But if someone quotes User, I still see User's messages inside quotation box, rendering the 'Ignore' ability pointless]. Maybe somehow still prevent User's quoted message blank or inaccessible to be read [within quotation box], unless removed from the 'Ignore List'.
This is not achievable in vBulletin and we won't be modifying the core system because that will obviously break and possibly cause any number of other problems.
Spoiler tags would work well for what you suggesting so if you want to see the post you have to click it
See above.
The site still doesn't love my mobile (Note 2)
What exactly is the problem? Mobile site or mobile app?
This has probably been suggested, but editing your own thread titles? Doable?
Not going to be allowed. People could change their thread title 100 times a day, or write PENISPENISPENIS. We have have SEO to consider.
Any chance that you could fix the What's New page on the mobile site so that the results link to the most recent post instead of the first page of each thread? If you navigate in through forums, they do link to the last page, just the what's new is odd
On the mobile site, I don't get any forum topic links sending me to the last page of a thread - I always land on the first page. No idea why your experience is different. It might be something that can be tweaked when we look at fixing design and bugs.