AMA Rules only permit two(2) connectors per line. I've seen some long clips to make up differences but nothing like 2".
5. Size, Construction and Measurement of Control Lines
Length, diameter, and types of lines permitted are stated under the specific rules for each event. The number and sizes of lines to be used, as specified for each event, are minimum requirements; they may be exceeded at the discretion of the contestant. However, if more and/or larger lines are used, no adjustment in the timing and/or judging procedures will be made to compensate for them. All lines used to control flights shall be steel wire or metal of equivalent strength, in good condition, and free from kinks and rust. Line connections to handle an aircraft must have a strength equal to or greater than that of the flying lines. No swivels are to be used as part of the control system of Control Line models. Control lines shall be of uniform diameter from the lead-out connections to the handle. No more than two (2) connectors may be used per line.