Out of interest how much of 2e's Handbooks, 3e, 4e's Rituals, or 5e has found its way into your table's game?
Relatively little. A fair bit of what became core 2e was in our games before 2e came out as we'd had the same ideas on our own. Didn't follow all the later splats very closely but I did steal a fair number of spells from later 2e.
From 3e, the main thing I swiped was the Sorcerer's casting mechanics - all my casters work that way now. Didn't like 4e's rituals, and they don't fit in with a hard-limit slot system in any case. Haven't taken anything from 5e really - thought about doing something with BIFTs then gave up on it.
One thing I've given lots of thought to but haven't ever got around to doing anything concrete with is pulling 4e's bloodied mechanic across. It has gobs of potential; even more so as we already use a body-fatigue hit point system.
And how do you incorporate new rules - the table voted, the DMs (as I know it's more than just you) or you alone?
Depends on the rule and how far-reaching it is.
For things like spell tweaks, it's usually the DMs' doing after (sometimes very!) long discussion. For other things it's often an outcome of ideas and informal discussion over the long term that I or we then crystallize into something solid. And for other things (especially things that haven't entered or impacted play yet) or trivial stuff it's DM prerogative.
An example: over the last few years some of us DMs, players, and interested others have been loosely booting around the idea of what a Swashbuckler class might look like in our games. A month or two back one of my players (who has also done some DMing) threw together some actual mechanics for a Swash which got discussed some; I took this and built from there, and now have the class fully written up.
When or if I'll get to introduce it and-or run it out for playtest, however, is a very open question. I don't like making big changes like this in mid-flight, and the current campaign shows no signs of running out of steam anytime soon. That said, there's various other long-discussed and pretty big changes also waiting in the wings which also really can't be introduced without a full reboot, so who knows?
