You still need a re-entry permit even if employed abroad.
You can get an expedite
If the applicant needs expedited processing, the Form I-131 instructions provide specific information for submitting pre-paid express mailers with the Form I-131 for USCIS to send the applicant’s receipt and ASC appointment notice, as well as the completed re-entry permit or refugee travel document, if approved. A request for expedited processing should contain the applicant's reasons for such processing so that USCIS may determine whether they qualify for expedited processing.
In addition, if the applicant must attend an ASC appointment in 14 days or less, the applicant may provide an email address or fax number so the Nebraska Service Center will be able to fax the ASC appointment to the applicant. The ASC is willing to accept this duplicate copy of the appointment notice.
If the applicant needs to expedite the I-131 after filing, then the applicant should contact the National Customer Service Center at 1-800-375-5283, or make an INFOPASS appointment at their local office.

Here is the link to the form
http://www.uscis.gov/portal/site/uscis/menuitem.5af9bb95919f35e66f614176543f6d1a/?vgnextoid=b11747a55773d010VgnVCM10000048f3d6a1RCRD&vgnextchannel=db029c7755cb9010VgnVCM10000045f3d6a1RCRD

I don't make the laws. Here is some information for you to read regarding your scheme to come in for 2 weeks every 2 months.
[INA Section 101(a)(27)(A)] says that a returning immigrant may be admitted to the US after traviling outside if they are returning from a “temporary” visit abroad [INA Section 101(a)(27)(A)]
What is temporary?
That is defined by case law.
See these links

http://caselaw.findlaw.com/us-1st-circuit/1074270.html

http://www.justice.gov/eoir/vll/intdec/vol17/2796.pdf

http://www.americanlaw.com/maintlpr.html

http://www.rreeves.com/articles/immigration_en_10329.php


Judith

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