3. Use less caps. - People who use caps as their primary ships hate this because it makes them feel less manly. Everybody else loves it because it means less imba fights.
4. Gain some skill. - Double standard here. People tend to say it to those less skilled than themselves when they whine about getting owned, but then they use the very same excuses to the people who own them. Oh well.
As I said, a full salvo already insta's bombers. Reducing the hull and nerfing agility means not only are they easier to hit, but it will take much less to wipe them out. It may be possible if you give them enough cargo to mount a higher armour upgade or raise their b/b limit, but then we're getting fiddly and the people will still whine about those more skilled than them.
Why longer fighter battles? They're enjoyable as is. I much prefer perseverance, skill or luck to simply holding the trigger for a few seconds every now and then.
At the MR/Guns thing, guns do the same job as the MR, it's just the MR does it in one shot then needs to regen, whilst the guns need a more consistent fire but can maintain said fire longer. Any bomber who's mounting dual MR's is meat for gunships/gunboats/capships, seeing as he loses his ability to kill them effectively.
The primary reason Bombers are the ship of choice for many players? Survival trait brought on after a month or two of being capwhored left, right and center. Some may do it because of the ability to instakill, but generally these people are skilled enough that the result would be the same if they used a fighter.