I finally solved my Intuos4+SAI trouble, thanks to the cold and boredom those forced me to digg in SAI files.
SAI has amazing file called [misc.ini] that allows to make some user tweaks for application. My problem was rooted in old SAI verison (1.0.1), that didn't have advanced options in its [misc.ini]. New SAI (Ver.1.1.0) allowed me to solve my trouble through [misc.ini] in seconds.
In addition, using SAI files, I made some other tweaks and share them, the small guide is about following things:
1. How to solve troubles with tablet pen speed.
2. How to rearrange palettes. Examples: 1, 2, 3
3. How to add custom canvas presets for new file.

• Tweaks are here •

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I couldn't solve the "Intuos4+SAI" trouble, so I had to return to work in Photoshop.
In my opinion, Photoshop is great graphics software, but is absolutely uncomfortable for CG. No color wheel, no handy brush palette, broken lines in zoom, no canvas rotation (even in CS4 it is realized more complicated than in Painter or SAI) etc., but it is possible to get into the way. The main annoying thing is loading by defalut of many things I never use for CG. So I tuned Photoshop a little for everyday work, and here are the tips I used.
Need to say two things:
- I tuned Photoshop for CGing, and some tips couldn't suit to other purproses like photo retouching or making layouts.
- I included in this guide some plain things you can see in every second tutorial, sorry for this, but without them the guide will be uncomplete. Maybe, even these simple tips will be helpful.

Part I • Part II • Part III

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How to make your own brushes
Photoshop has magic tool called 'Define Brush' that allows you to create a brush of desired shape in seconds. SAI can't do this, but process of creating custom brushes isn't too difficult.

1. Overall
There are two types of brushes in SAI. Each type has its own folder where your pictures must be placed to turn into brushes. These folders are 'Elemap' and 'Blotmap' in your SAI directory. The scheme is: make a picture -> place it in corresponding folder -> add a line in brushform.conf file -> save this file -> done.

2. Creating of 'Elemap' Brushes
Adress of these brushes in brushform.conf will be [2,elemap\Your Brush Name.bmp]
You need the a template (included in archive).
Choose desired brush shape and set its painting mode as 'Threshold'. With opacity variation you'll get different results. Than save your image as *bmp with standart settings Photoshop suggests.
Unfortunately, it doesn't mean that you can just transfer your favorite Photoshop brush shapes to SAI. For example, if your shape is star, you don't get brush that will be paint stars. Star shape gives something like this. To say the truth, the Streak shape of different thickness will be the most common result you'll get.

3. Creating of 'Blotmap' Brushes
Adress of these brushes in brushform.conf will be [1,blotmap\Your Brush Name.bmp]
Your image should be 512x512 px. Paint your texture in black-and-white, in final image black points will be transparent, white will be solid color.
Set mode for your image as Index (Image -> Mode -> Indexed Color) and save it as *bmp.

4. How to install created brushes
Give a name for each of your brushes.
Put the pictures to 'Elemap' and 'Blotmap' folders.
Add lines with names of your new brushes to your brushform.conf in SAI directory like it is written above .
If you don't want to write this manually, there is useful tool by BerolEagle that updates brushform.conf with all items from 'Elemap' and 'Blotmap' folders. This way, just copy your new brushes to corresponding folders, copy the tool in your SAI directory, and run it.
Your new brushes appear in drop down menu right under 'Density' option.

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Okay, the walkthrough.
I thought that I can just write "I used simple round brush and simple round eraser", but on closer examination it turned out that it wasn't so. While making this tutorial I understood how many minor things are used in creation every picture besides brush. These features are habitual for artists, but many of them like definition of color scheme and setting, use of reference, layer blending modes, masks, custom hints would be interesting...
In this walkthrough I just made screenshots of main stages of work and indicated tools and settings of them used on every stage. Also, there is the color chart of the image.

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