That's what I would say too, I just wanted to be sure we're on the same page. So, here's a short list of things I would think to do to promote ranged vs. Melee
1) classes aren't immediately proficient with classic weapons. A very short list (baton, dagger, arm-blade) exists for the characters who still want that option. Anything not immediately presented in the guide is exotic.
2) shooting a firearm in melee doesn't draw an attack of opportunity. firearms add Dexterity modifier to damage (energy bows and some rifles can still use Str if you buy them as composite). Some firearms (sonic pistols for example) deal more damage when you're closer. All firearms are superior/more efficient in cost and functionality to melee weapons.
3) Allow for attacks of opportunity to extend to ranged weapons within 1 increment. If a character isn't carefully avoiding getting shot (retreat), he probably will be.
4) Review melee-centric feats and find a ranged alternative. Tripping probably wouldn't be a huge issue in this setting, but disarming would make more sense. Other examples include:
* Spring attack now allows you to make any attack (melee or ranged).
* Cut the BAB requirement on other ranged-centric feats in half (Improved Precise shot requires +4, Pinpoint Targeting +8, Manyshot +3)
Ricochet (combat)
You can shoot two nearby foes with a single round.
Prerequisites: Dex 13, Deadly Aim, base attack bonus +1.
Benefit: As a standard action, you can make a single ranged attack at your full base attack bonus against a foe within 1 range increment. If you hit, you deal damage normally and can make an additional attack (using your full base attack bonus) against another foe that is within 10 ft. of the first and also within range. You can only make one additional attack per round with this feat. You leave yourself exposed when you use this feat, so you take a –2 penalty to your Armor Class until your next turn.
Uncanny Ricochet (combat)
You can shoot nearby foes with a single round.
Prerequisites: Dex 13, Ricochet, base attack bonus +4.
Benefit: When you use Ricochet, you can continue to make additional attacks so long as you continue to hit targets that meet the requirements. You cannot attack an individual foe more than once as a result of this feat.
Scattershot (Combat)
You unleash a barrage of carefully calculated attacks against your enemies.
Prerequisites: Dex 13, Int 13, Combat Expertise, shot on the run, base attack bonus +4.
Benefit: When you use the full-attack action, you can give up your regular attacks and instead make one ranged attack at your highest base attack bonus against each opponent within range. You must make a separate attack roll against each opponent.
When you use the Scattershot feat, you also forfeit any bonus or extra attacks granted by other feats, spells, or abilities.