DreamWeaver supports setting file permissions control, through the use of a 3rd-party "extension" or "plug-in."

This "SetPermissions" plug-in is available by right clicking the link below and choosing to "Save to Desktop" or "Save File As..." or similar:

SetPermissions3.mxp

After you have downloaded the plug-in, use DreamWeaver's "Extensions Manager" to install it.
After installing and relaunching DreamWeaver, you can then right-click on your remote files and adjuts permissions for same.