centering custom font

I see it as a bit of a style/readability thing.... Since they are bits, (0,1,2,4), using "+", to me it reads that I'm doing both of the justifications (horizontal plus vertical), while if I see "|" or "or", it could be one or both (& would result in 0, so that shouldn't be used though)

As I said, this isn't really a problem for the expression you're looking at. For you, an experienced programmer, this is not a problem. For a guy just getting started, it will end up being a problem after they copy your code and modify it later not realizing the consequences of using addition where a bitwise or was more appropriate. For most people, it is easier to learn rules if they are simple and there are few exceptions. For them it is typically much simpler to learn to use use bitwise operators when dealing with bit masks, and just leave it at that.

For those who are following this discussion, here is an example of why using addition to combine bitmask values can cause problems.

class Thing
{
enum {
REQUIREMENT_1_SATISFIED = 1,
REQUIREMENT_2_SATISFIED = 2
}

hidden var requirements = 0;

function satisfyRequirement1() {
requirements = requirements + REQUIREMENT_1_SATISFIED;
}

function satisfyRequirement2() {
requirements = requirements + REQUIREMENT_2_SATISFIED;
}
}


Now consider the following code...

var thing = new Thing();
thing.satisfyRequirement1();
thing.satisfyRequirement1();


The result would be that requirements indicate requirement 2 had been satisfied, even though it had never been. If the bitwise or operator was used, this would not be an issue.