That's all the one I have does, aside from the cheapo bass boost. I'm sure they get more feature packed depending on how much you wanna drop. But when it comes to treble/bass/mids etc., I don't think there's a lot more any amp can do for you that the equalizer can't, because it's pretty much all the same shit = an equalizer that controls those qualities.
The reason why the bass is not so hot is because players default to "flat" equalization...everything equal and at the middle setting so people don't blow out their ears or think it sounds like shit out of the box. Past that, I don't know shit about equalizer adjustment, but there are probably tons of guides. or just check out a preset.