1) Make the ending time random to prevent last minute attempts to boost the PvP rating.
I am still against this reset idea, and would prefer a decay. But this is at least better than what is right now.
2) Change the bounty board back so that all PvP hits confer a rating adjustment rather than just the final completer of the bounty.
Yes please, but fix the rating transfer. Earning 544 rating points with 265 hits on 19 bounties (b4 the 20hitters were removed), and then having 157 points removed by a 10 hit counter bounty is rigoddamnediculous.
3) Apply a reduction in PvP rating transfer to bounties, dependent on how much higher the attacking player is above the bounty target.
Hmm... sure.. this would greatly benefit those at lower lvls.
Wouldn't you say it was harder for a lower level to defeat a higher level due to the availability of items etc.?
Depends on how much lower. At lvl 400 or so, it is not impossible to combine gear and buffs to beat a lvl 900.
It don't see it as penalizing higher levels. Firstly it only affects the bounty board, as normally the +/- 20 level range would not be enough to confer a reduction. Secondly, it would be much easier for a level 300 player for example to defeat a bounty target that is level 100, hence a reduction in the PvP rating transfer would reflect the skill involved in the battle (hope this makes sense!) 
It makes sense, but it is penalizing the higher lvls, since we have only a few targets to smack for rating, and with this implemented, we wouldn't get any from the board either. Oh, and we would loose it all on the first bounty placed for hitting off the board.
Just to be clear, the reduction should only be in effect for major differences in level right? Something like... 25% of the player's level for above level 100.
Indeed - we'll finalize the actual ranges and reductions later - we're just looking for discussion/opinions on the overall idea at the moment 
This is in a sense taking away bounty hunting for anyone above lvl 800, if they're after rating. It oughta be enough that we already have to pay insane ticket prices to undertake bounties at lvl 400-500 where it seems the most action is.
And for the love of cows, do not make a reverse rating gain, where the lower lvls get more from the higher lvls! As written above, it would devastate the rating of any high lvl players to get cleared by a lvl 400ish.
4) Remove stamina limitations from bounties.
Yes yes yes yes yes!
I maintain my suggestion of removing the PvP ladder tokens relation to PvP rating! Rename it into PvP tokens, and make it 1 token per kill, on/off board - also including defensive kills. At the same time bounce up the prices for the pvp rewards.. make it similar to the loyalty rewards.
The rating already has a medal in the end of it, just widen the dominance medal to a top 10 to ease the tension on it.
Any player PvPing off the board will earn a rather small sum of PvP rating, and at this time, it will only take 1-2 bounties to strip it all away again, if the takers of the bounty has a lower pvp rating. This is not rewarding the PvPers, this is punishing the PvPers.