The answer to this question depends on your skill, their skill and depth of stacks.
Against crappy opposition, flat out, no question you want more players in the hand with KQs. The people advocating an iso raise get rewarded more often, no doubt, but they get rewarded less, much less. Against poor opposition, your implied odds are great and are only multiplied with more players. You want to play more hands and have more playing.

As opposition skill increases, equity decreases (due to the quality of played hands), implied odds decrease and fold equity post flop increases. All reasons to limit the field.

I don't necessarily disagree with you because we can win big pots this way.

Although again in a multiway if we hit our flush there are Suited Ace Rag staying around that make us lose big pots also where as smaller flushes might still be concerned. If we don't make our straight or flush we often cant take dead money because a lot of time people have got something that they wont fold. I'd be concerned about hitting king or queen on dry flops against AQ AK sets etc as well which we would have to pay off a lot of times.

Pros and cons - I suppose the better you are the easier it is.

It's simple really. You can raise to $25 and get 5 callers or you can raise to $45 and get 2 callers. Either way, the pot size will be roughly the same. However, against 2 callers, not only can you steal the pot a lot when you miss, it's also more likely your pair will hold up when you hit. Also it's easier to hand read, etc.

The whole thin about flush over flushing people and coolering people is a load of bull. Flush over flush happens so rarely that I'm not going to do a small raise to keep in the field in hopes of coolering people.

Slim, ffs, the next time you decide to post, wait 90secs before you hit "send", as you'll inevitably think of something else to add, so you don't end up with back-to-back posts. Itt alone you have 2 sets of back-to-back posts. Plenty of other threads you do the same. Another alternative is to edit your first response and add new thoughts to that. It's just courtesy for those on phones and such that have to scroll through all the posts.
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Sooted broadways (KQs, QJs) are a raise all day every day. I'm ok with $12-15, depending on table conditions. You'll surely still get 3-4 callers, but your folding out the garbage that can make miracle hands, but you're also building a big enough pot that you can drop the hammer quickly with the right flop.

If we hit TPGK, bombs away with full pot, iso a weaker hand and take it down. Draws get played more cautiously to not iso and keep the implieds high.

Don't ever over-limp from LP. With ANY cards. Just don't do it. If it's not worth playing for a raise, it's not worth playing at all imo.

Grunch:
The nice thing about a hand like KQs is it has a lot of options and playability, i think anything (but folding) is fine. That being said I do highly prefer raising and usually on the larger side. It's nice to get heads up or 3 handed, in position and with lots of dead money. Also if we just take it down we are happy there too.

Now that I've read through I can basically agree with this. I don't really know your skill level but if you are somewhat competent in board textures and hand reading you will realize how much better raising is and may even find yourself sometimes raising with JT and other hands you used to just play passive and multiway. This can be especially powerful with a tight image: people will put you on AK so you can steal those boards and the boards that hit fish ranges often hit yours (89TJQ cards).