Question: is there any *true* dual-wielding mod that allows you to do damage with any combination of weapons you have? (not any preset set, as I've a custom defensive dagger created by myself), maybe apart from Unnecesary Violence?
No, not really. UV is the best DW mod out there right now, with UV2 coming up as the better.
Edit: Actually, now that I think about it, Ambidextrie (sp?) was out before UV, but it was very buggy. I never could get it to work properly. Hex actually used Ambidextrie as a base to his mod anyways, so it is a superior mod over it.
Is there anything that displays text or some sort of visual cue when I'm in combat?
Look up the mod called Scathe