Have the possibility to change the user and group ACL's on artifacts

In some cases, artifacts needs to be executable or modifiable. Particularly for Copy Artifact and Artifact Deployer, have an option to change the rwx for user and group (other could be too risky).
For example, two choice list (one for user, one for group) with one possible choice among :
default
r
rw
rx
rwx

default for both user and group being the current settings.