H１B 延期是否要用加快（Primium Processing,PP）?

H１B 延期是否要用加快
因为前段时间在下刚把H１B 延了，有一鳞半爪的经验，向需要的网友介绍。
可考虑PP的情况：
１。近期要出美国又没有AP
２。要RENEW DRIVER LICENSE
３。家人需H４（签证或延期）
４。＄１０００是公司出，或家里有很多＄＄＄＄＄
不用PP是否可以：
１。足够的早时间（４－６个月）办延期
２。足够的时间递H１B的申请：
笨人的是一个月，JULY ２８（周５递），AUG ３支票
CASHED，得到CASE NUMBER。
法律依据（from CIS web）：
Chapter 8, Section 274a.12(b）(20) of the U.S. Code of Federal Regulations
全文：
(20) A nonimmigrant alien within the class of aliens described in paragraphs (b)(2), (b)(5), (b)(8), (b)(9), (b)(10), (b)(11), (b)(12), (b)(13), (b)(14), (b)(16), and (b)(19) of this section whose status has expired but who has filed a timely application for an extension of such stay pursuant to Secs. 214.2 or 214.6 of this chapter. These aliens are authorized to continue employment with the same employer for a period not to exceed 240 days beginning on the date of the expiration of the authorized period of stay. Such authorization shall be subject to any conditions and limitations noted on the initial authorization. However, if the district director or service center director adjudicates the application prior to the expiration of this 240 day period and denies the application for extension of stay, the employment aut horization under this paragraph shall automatically terminate upon notification of the denial decision. (Revised 1/1/94; 58 FR 69217)
连接：
http://www.uscis.gov/propub/ProPubVAP.jsp?dockey=37af6486eb2edd33f062f159759ed51b
解释：
只要递上H１B的延期申请，在没有得到批准的情况，该工人仍然可以合法工作２４０天