I'm revisiting this earlier controversial opinion of mine because I'm feeling ornery tonight:
People make a big deal over "string bets" for no good reason. The classic movie-style declaration "I'll see you... and raise..." is neither ambiguous nor admitting of angle shooting, for anyone capable of hearing and understanding conversational inflections. It's obvious that the bettor's wager is still in progress and it's obvious when it's complete.
The hyperfine technicalities explicated in, for example, the TDA rules are a logistical necessity for handling large-scale operations with large numbers of essentially anonymous players and large numbers of dealers in order to keep irregularities to a minimum, and, so, accordingly, it's simply easier for casinos to require bettors to follow a more formally-structured betting style. But for a home game there's no compelling reason to follow their lead other than, as many members here do, that you simply prefer to be as formal as casinos.
I'll see my "the rule against string betting is crap" and raise myself "all the other rules about placing bets are crap too".
Forward motion, single motion, betting line, releasing chips, cutting chips - it's all bullshit. The only betting rule needed for a civilized game of poker is this: "Your bet is whatever you verbalize, or whatever chips you've put in front of you when you're done putting chips in front you, whichever comes first."
"BUT EDDIE" I hear you say, "How can you tell when someone is done putting chips in front of them?"
I say that if you have problems figuring this out you shouldn't be trusted with sharp objects, let alone be allowed to play poker.
If it's absolutely necessary, it's pretty easy to enforce. The house/floor/host can start handing out penalties when people are being idiots and/or assholes. If someone takes for-fucking-ever to finish placing their bet, and keeps looking up to see if their opponent is reacting ("angle shooting" although it really isn't, it's just being a dumbass and hoping your opponent is an even bigger dumbass), slap 'em with a penalty, return their chips, and kill their hand. And on the other side of the coin, if someone jumps in and calls while the guy in front of them is obviously still counting out chips, slap 'em with a penalty, return their chips, and kill their hand. Do this a few times and people will get the point - stop being jerks and play nice with with the other people sitting around the table. Anyone who doesn't get it can GTFO.
As mentioned in my post above, I get it why casinos can't operate like this (any more... they
used to, though). But home games can, and should. And I kinda think that maybe casinos and tournament directors should have stuck to doing it this way all along.
More rulesets should be written with language like "In such-and-such situation, do the clearly obvious thing. If you're not sure what that is, call the floor, and expect to get kicked out of the game."