the person representing should have the consent of the advocate having vakalathnama. And more over he can only represent or conduct the case for the person having vakalathnama but he cannot give any thing in writting with his signature attested to it. He can produce documents with a petitioner signed by the advocate having vakalathnama.
for example a court ordered to file consent terms, in many a cases advocate without taking into confidence petitioner / appellant ( advocate ) filed consent terms so as per your @ email@example.com advice that is illegal
A vakalatnama given by a party to an advocate will authorise the advocate to conduct the case on behalf of his party within the legal limits. Any decision to be taken out of court of compromise will be in the knowledge of the party to the proceedings and he has to give his consent in writing towards such settlements, without which it will be considered illegal. You can very well contest if you found any irregularity done without your knowledge by representing before court in writing.
to clarify and answer, the petitioner/appellant cannot modify a Vakalatnama. your advocate who prepares (signs) the vakalatnama to represent you in cvourt. All other documemts which will have to be submitted and which do not require your signature can be signed bu him. eg. some formality in the department of the court etc). however, to file the papers/docs in court your signatures on those docs wil be required.
a party has aright to engage more than one advocate. if he changes already engaged advocate, he should withdraw him with his consent. later on, he can change. advocate gives his services on considerations. if any part of it is due, it should be paid first. then he can change. ADV-prakash jain indore.