Along with your suggestions, I'd also like to have ASTR, LSTR and END influence your total SIZ.
Biggest problem with the size attribute is that I'm not sure it's going to make a significant difference unless you have substantially larger/smaller size than normal.
For example, things like bats, magpies and floating eyes are very hard to hit because they're very small - if we're talking reasonable
changes to the size attribute I think it'd end up being more for flavor than anything.
But then again, there's no reason why we couldn't expand what size does, or more importantly, come to a decision on what it actually stands for.
The old idea was height (as discussed elsewhere) but ther