Computational and Mathematical Methods in Medicine doesn't care if you are an economist. I proposed an off-topic special issue and here is the response (emphasis added):
Dear John,
I am glad that you are interested in Lead Guest Editing a Special Issue on Measuring the nonmarket value of recreational fishing for Computational and Mathematical Methods in Medicine. In order to move forward, you will need to select a topic and then invite two to four Guest Editors of appropriate seniority to work with you on the Special Issue. The Guest Editors should be geographically dispersed and have the time and capacity to work on this Special Issue. They should also be willing to actively participate in the review process of the submitted manuscripts. As Lead Guest Editor, you are required to select, contact, and get the approval of the team of Guest Editors to participate in the issue.
You will also need to prepare a tentative Call for Papers containing the proposed aims, scope, and list of topics for the Special Issue and send it to me. I have attached a few Calls for Papers from other recently launched Special Issues as relevant examples.
In addition to the proposed Call for Papers, you may submit a cover letter in which you answer some of the following questions: (i) Why do you feel that the issue is important and timely? (ii) What communities are expected to participate in the Special Issue? (iii) How are the background and expertise of the Guest Editorial team relevant to the proposed Special Issue?
There will be a formal approval process for the Special Issue by the journal's Editorial Board, which takes approximately one week. Upon approval, we will proceed with the launch and promotion of the Special Issue.
The Guest Editorial team as a whole is allowed to contribute a maximum of four papers to their Special Issue. Of these four, one introductory short Editorial and one long Review Article are exempt from the journal’s regular open access publication charges, while the other two articles are subject to the charges. As for the timeline of the Special Issue, we like to give submitting authors approximately six months from the initial Call for Papers to the submission deadline, another three months to the First Round of Reviews, and an additional two months to the Publication Date. However, we welcome adjustments to the submission deadline to suit your schedule.
Please feel free to let me know of any questions you might have. Otherwise, I look forward to receiving your tentative Call for Papers.
And, just if case you were wondering about the hierarchy at env-econ.net, they asked me first! I'm better than you, na-na, na-na, boo-boo, stick your head in doo-doo.