You're playing one of the only two classes that doesn't have a viable dexterity build, the other being dark knights. Also, what level are you? Dexterity is one of the strongest stats for both hunters and snipers. There are warlock and sorcerer builds that max dexterity as well. There's also a crusader AoE survivability build that maxes dexterity for grandcross spam. Thieves can make on-hit dexterity builds for high dps and grinding but it's terrible in PvP.
I agree at first glance dexterity looks awful but the buffs you're suggesting are ridiculously overpowered. If you think +1 dodge/+5 dodge per milestone is fair, you're either dreaming or don't realize the value of dodge. Also, if you think 1% attack speed/5% attack speed per milestone is fair, you need to check your math or actually bother to do some.
I honestly, to a small degree, agree that dexterity needs a buff, but not what you're suggesting. I would be happy to see it jump to 0.5% attack speed per point, 2.5% attack speed per milestone. Or even 0.33%/2.5%. If it were to add dodge, it would have to add it in values similar or possibly lower than the attack speed amount. ie. 0.2 dodge/2dodge.
With the way dexterity currently is, hunters can get up to 4 attacks per second while beastly fury is up. The hunter's best talent hands down is Buzzing Arrows which has a 7% chance on attack to drop a bomb on the enemy dealing massive AoE damage. There is also several on-hit proc cards you can slot in your gloves for a similar effect. On top of those, there are seals you can get that have a small chance of applying bleeds, burns, and poisons that deal immense amounts of damage. Built properly hunters should always auto-attack and only ever use skills as utility to keep the enemy away.
Snipers are capable of similar builds to the hunter. The sniper's strongest build as far as sustained damage goes is an on-hit air damage proc build. Snipers aren't capable of the amount of attacks per second as hunters are but they also have Sniper Shot, originally a 2.5 second cast, that deals upwards of 20,000 damage (tooltip), non-crit, that can be brought down to 1.5 seconds pretty easily with how dex currently is. This ability needs to be interrupted in PvP, or it typically results in someone's death. They lose a lot of accuracy (Sniper's strength/attack) and/or crit chance by doing so, but it's very viable. If dex was too much stronger than it is now (ie. your 1%/5% suggestion), Sniper's could get 250% attack speed before any gear, seals, or cards, resulting in a Sniper Shot cast time under 1 second. Good luck interrupting/surviving that.
Sorcerers and Warlocks both have cast time abilities and dexterity builds are viable on them similarly to how they're viable to the Sniper class with Sniper Shot. Their abilities will be a little weaker but cast much faster. This is especially true for the abilities Chaos Bolt, Lightning Bolt, and the ability that looks like Arcane Blast that I can't currently think of the name of. There's a mage talent that makes spamming the same ability over and over again stronger each time. Dex builds with this talent can be broken, in end game gear.
In general, dexterity is not very strong for the other four classes, but Crusaders and Thieves can still make builds around dexterity. It can even be useful to DKs and Assassins in small amounts for ability weaving and energy conservation.
Coming back to an original question/concern; what level are you? Strength is not as strong as you probably think it is late game.
Simple math example:
At level 10, your weapon may have something like 20 attack. 1 point of strength increases that by 2 attack. That's a 10% attack increase (2/20 = 0.1*100 = 10%).
At level 60, your +10 weapon may have something more like 800 attack. 1 point of strength still only increases that by 2 attack. That's a 0.25% attack increase
(2/800 = 0.0025*100 = 0.25%).
Currently, as a Sniper, I will likely be stopping my accuracy whenever I hit about 1,000 attack. The rest of my points will be split across dexterity, stamina, and luck. Probably 1:1:1, but I'll have to toy with it a little more.
In conclusion, it's unfortunate dexterity isn't very strong for your class, even though it's still arguably viable late game, but buffing it, especially by the numbers you're suggesting, would be ridiculously overpowered for every other class. I do agree, again, a very small dexterity buff may be in order though.
~ Razzista, level 57 Sniper, math major dropout, been writing MMO guides and inventing builds and strats since I was a wee lad.