[airscape17]

Most of the time, when I slide (as in the articulation) on the heavier wound strings, I get a very bad scrape.

Is there anything I can do to minimize this, like by sliding faster or slower, with more or less pressure on the string, or is there anything I can do to my fret-hand finger tips like rubbing them on the wound strings before I play to build up my calluses.

Some 'unintentionally bad' playing can be good as it sounds natrual. I just sound crap though

[pimp_vince]

not much you can do about string squeak, some suggestions are elixir strings (nanoweb cuts down on it, polyweb kills string squeak). Fast fret does the same thing but it's a spray and it feels greasy apparently, also don't get any spray on the body of the guitar as it strips the finish over time.
sliding faster might help but i'm not sure, i don't have much of a probem with it.

[wavewalker]

That will help. But, that sound is part of the music. You can shape it.

[pimp_vince]

basically you learn to cope with, and take advantage of that scrape, just listen to wish you were here, by pink floyd, you can hear that scrape. it gives it a nice sound.

[dadfad]

It's a pretty acceptible sound in acoustic. Fret lubricant will help a bit. Also, for a specific playing period (like a very special set-closer solo, an important one-tune gig, or a recording session, etc) you CAN......

a)place a piece of thick paper or cardboard under your strings
b)take a piece of ultra-fine sandpaper or emery paper (1200 to 1600 grit)
c)gently sand the top part of the wound strings IN THE AREA TO BE FRETTED
d)wipe them down with fret lubricant

Sand lightly in a nut-to-saddle direction. Don't do the whole length of the strings (picked and un-fretted areas don't matter, you want the strings left as un-changed as possible). Be careful of your board and frets being protected. Like I said, this is temporary. As you normally re-tune, tighten, etc the strings will rotate randomly, moving the un-smoothed sides around back to the top and so forth. This technique used to be used for recording sessions sometimes. Like I said, it's not for general use, just a specific short period of time when purity of sound is extremely important.

[goober]

Some 'unintentionally bad' playing can be good as it sounds natrual.

My great uncle, who used to carve things out of wood, once told me that some marks by the tools are important because they show that it was made by a man and not a machine. He was cool.