Honestly? I think making it HL2-like is a great idea, I'll work on that. Regarding movement, it becomes a lot more responsive as you acquire more movement upgrades, and I kinda want to keep it this way. I will experiment with stronger auto-braking, though.
Needing to turn off a shield to pick up things was something I didn't put much thought into, it just felt "right", but if it's a source of annoyance then I'll opt against it.