I am going to assume you looked for the "weapon - allowed movement" but did not know where exactly to look, with the utmost respect to you and your attempts to help other in the community, as the aforementioned attribute of weapons directly relates to "the diamondback: fire on the move effect" that you mentioned. The "weapon – allowed movement" is an attribute that determines at what speed weapons can be fired from moving units; it has three settings which are, moving, slowing, or none. Moving, as its name implies, allows units to travel at full speed while firing. Units with this attribute include but are not limited to the baneling and the void ray, and of course the diamondback. Slowing affects more units on a standard non-modified basis, slowing, as its name implies, slows moving units when they fire. Units with this attribute are the banshee, the mutalisk, the carrier, and most other air units. None, again as the name implies, allows no movements when units are firing. This attribute is applied to most ground units. The "weapon – allowed movement" is the name of a field or a list of these three attributes the designers of the game created to save data space and I hope easier access for the end user of the data edit to the function these attributes affect. Depending on how you have your data editor set up you'll find this field in one of three ways; the first and for me the easiest way is the weapon's sub tap to the right of the UI sub tab of every weapon in the weapons' tab of the data editor; the second and third ways are as "weapon – allowed movement" or "allowed movement" if you have the data editor set up in a list display format. I hope that this long-winded explanation is of service to the community.
Edited by DagonDragoon on 7/12/2011 9:09 AM PDT