Limited Scope Representation
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LSR is allowed in missouri by the Supreme Court of Missouri. Rule 4-1.2(c) provides, “A lawyer may limit the scope of representation if the client gives informed consent in a writing signed by the client to the essential terms of the representation and the lawyer’s limited role.”
For communicating with the opposition's lawyer, the limited scope representation client is regarded as unrepresented.
More at https://www.courts.mo.gov/page.jsp?id=42938
LSR lawyer does not sign papers. Rule 55.03(a)
If lawyer appears, it is presumed to be a general appearance unless noticed as Entry of Limited Appearance Rule 55.03(b)(3)
Pro Bono Attorneys' Deskbook info on LSR