Here are my opinions on your 11 points.
1.) Allow dexterity a chance to dodge ticks of reflect damage.
A good idea in theory, But would only work if armour and AR really reduced reflect damage too to make it fair for all classes.
2.) Give all classes the "30% damage reduction" that melee's have to use against reflects damage
Sure . . . if you want to give the melee classes uber ranged skills too. Seriously though very bad idea. Ranged have ranged skills, melee don't hence the 30%.
3.) Allow life steal to roll on something other than weapons.
Learn to love Life regen. It rolls on armour pieces.
4.) Cap reflects damage to do as much as standing in an arcane beam (Do you think it should hit harder than arcane beams?)
Yes. The more glass a player is the more it should hurt. Makes people have to think on how to beat them. Or play tank and just laugh at reflect.
5.) Cap reflects damage to only come from 1 source or allow it to only be on 1 mob in the group at a time and not every mob in the group.
Then you'd have to cap every other monster affix to 1 too. Not a good idea.
6.) Make reflects damage toggle on after a couple seconds of engaging a player.
If this was not abusable to people could only attack when it's not active then sure. This is a good idea.
7.) Cap the range of reflects damage so It won't hit you if you're 30 yards away.
Then ranged will never get hit by reflect damage cause they'll kite from far away. And melee will always feel it. Not fair. Bad idea.
8.) Cap reflects damage to do no more than XX% of the players health per second.
A nice idea in theory. But the whole point of reflect is to become harder to beat the more glass the character is. capped at a % of your health just means high dps glass with some LS will just attack a lot and out heal the reflect. Making heavy glass characters better for reflect and that's not the idea. Quite the opposite actually.
9.) Make reflects damage unable to hurt when the player is below 10% health and unable to do lethal damage.
So ranged just spam the elites at range and will never kill them cause skilled ranged players can avoid direct elite hits. This effectively negates the pain of reflect. Reflect is supposed to hurt high dps players.
10.) Make critical hits reflect the same amount of damage as a normal hit.
So players with tiny non crit hits but large crits and large LS from crits will never feel reflect damage. Again your idea makes glass have an easier time. Reflect is meant to cause glass pain. So bad idea from you.
11.) Turn the damage reflected into a ball of energy that appears over the mobs head for 1 second (spirit bomb?!) then fires at the player allowing the player a chance to react and skill dodge
A very nice idea in theory. But then it just becomes a frozen or a molten explosion. everyone just runs away from it. People think jailer is nasty cause it has no delay. If you had it so the beam from reflect as you put it always hut the player (can't be dodged or blocked) but can be line of sight dodged. Ie only way to avoid being hit by it was to run behind a wall or pillar. That might possibly work. But the hurt from getting from it would have to be pretty high to balance it.