I know, what there is the feature, which allows you to move overward the glyph palette with the arrows. But I find more comfortable to move by wasd, because arrows are on the right side of the keyboard and my right hand is busy with the mouse.
Can I somehow rebind the keys?
Nope, rebinding isn't supported by the engine itself, and not currently in REXPaint, either. It might be added in the future, but I dunno it's not really set up for that so even adding it it's kinda substandard (like what Cogmind has--they use the same engine and the latter does have a rebinding system).
I'm sure it's kind of annoying to do so, but I know you can technically manage rebinding for something like REXPaint via external programs like AutoHotKey, if that helps.
Okаy, I wrote a small script in AutoHotkey to do that. If anyone needs that - just input this into the AutoHotkey script:
w::~Up
a::~Left
s::~Down
d::~Right
And this will work. These letters aren't used somewhere else, so there is no need in altering them.
How about text tool?
edit:
I mean, it would be impossible to type WASD characters with Text writing tool.
?