Best place to define plugins' constants?

[Carlos]

The user can then define the constant in gsconfig.php, but if he doesn't, the default value is defined in the plugin itself.

That was what I meant: only for customisation, as default values would be set (your way) by the plugin -- just like GS does with all those #-commented defines.

So you don't think it's a bad idea using gsconfig.php for these things..