In the Hotel Clerk/register drama, I don't think action is even necessary -- what else would be he asking Earl to sign?
HOTEL CLERK
Sign here.
EARL
Sure is a nice place you got.
...during this, I'm gonna assume the Clerk points to the register and Earl signs it. Trivial action hardly worth detailing.
I regard parentheticals as dialogue or emotion modifiers that help us hear how the character is spitting out the words, or to clarify who the character is speaking to, not somewhere to insert action. (I've seen articles that warn against doing this too often since actors don't like being told how to interpret their role, or somesuch reasoning.) But if action is called for because it happens simultaneously with dialogue, at least make it short, e.g.
FRED
Looks like my idea didn't work!
JIM
(punching him)
Ya think?
I've no problem with "Francis exits" or "Dorothy enters" or whatever -- it's basic people movement, just say it. Modify with action by all means, "Jerry marches out, slams the door." "Sam kicks the door open." etc.
-Derek