Distribution zip doesn't contain executable flags for scripts

[trancexpress]

E.g. the distribution spotbugs-4.7.3.zip as the following file permissions in the bin/ folder:

drwxr-xr-x 4 sandreev users 4096 Feb  1  1980 .
drwxr-xr-x 6 sandreev users 4096 Feb  1  1980 ..
-rw-rw-r-- 1 sandreev users   77 Feb  1  1980 addMessages
-rw-rw-r-- 1 sandreev users  189 Feb  1  1980 computeBugHistory
-rw-rw-r-- 1 sandreev users   85 Feb  1  1980 convertXmlToText
-rw-rw-r-- 1 sandreev users   90 Feb  1  1980 copyBuggySource
-rw-rw-r-- 1 sandreev users  145 Feb  1  1980 defectDensity
drwxrwxr-x 2 sandreev users 4096 Feb  1  1980 deprecated
drwxrwxr-x 2 sandreev users 4096 Feb  1  1980 experimental
-rw-rw-r-- 1 sandreev users 4280 Feb  1  1980 fb
-rw-rw-r-- 1 sandreev users 2053 Feb  1  1980 fbwrap
-rw-rw-r-- 1 sandreev users  186 Feb  1  1980 filterBugs
-rw-rw-r-- 1 sandreev users   96 Feb  1  1980 findbugs-msv
-rw-rw-r-- 1 sandreev users   94 Feb  1  1980 listBugDatabaseInfo
-rw-rw-r-- 1 sandreev users   89 Feb  1  1980 mineBugHistory
-rw-rw-r-- 1 sandreev users   90 Feb  1  1980 printAppVersion
-rw-rw-r-- 1 sandreev users   87 Feb  1  1980 printClass
-rw-rw-r-- 1 sandreev users   98 Feb  1  1980 rejarForAnalysis
-rw-rw-r-- 1 sandreev users   93 Feb  1  1980 setBugDatabaseInfo
-rw-rw-r-- 1 sandreev users 4387 Feb  1  1980 spotbugs
-rw-rw-r-- 1 sandreev users 3185 Feb  1  1980 spotbugs2
-rw-rw-r-- 1 sandreev users 6636 Feb  1  1980 spotbugs.bat
-rw-rw-r-- 1 sandreev users 9662 Feb  1  1980 spotbugs.ico
-rw-rw-r-- 1 sandreev users  197 Feb  1  1980 unionBugs
-rw-rw-r-- 1 sandreev users   79 Feb  1  1980 xpathFind

It would be great if the execute flag is set, so that the distribution can be used after unpacking, without setting the execute flag to run the scripts.