It can affect skills that are pinned to it, but it doesn't play into damage from standard bow attacks as far as I'm aware. Gabe just uses the standard RPG Maker XP combat engine, so if you want more detailed information look for documentation on that.
This engine is from like 2004-2005, and it's meant for hobbyists to work with. It uses then-familiar concepts from the 90s that are really straight-forward. You won't find stat synergy or anything like that unless somebody has hacked it in. Since Gabe doesn't touch the combat particularly, if you want more standard damage, you need to go for more ATK/STR every time.
The only weird thing I remember is that EVA is sort of accidentally OP because it's never offset by anything when hit chances are calculated. AGI and EVA together make up dodge chance in the formula, but DEX only decreases AGI. Hence why you can sit there in a lot of RPG XP games and miss all the time, if the dev just blindly gave enemies even a middling amount of EVA. At least, that's how it was originally. It might have been patched, or it might be well-known enough that almost every dev still using XP (probably Gabe and maybe two guys in Idaho?) includes a standard hack to fix the issue.
