I have this thought about this for some time already. I can't say it's very urgent thing to consider, but we are approaching the moment when engine development branches are joined, and refactored code is pushed to master branch. Probably people would like to improve engine more intensively and add new features, including new script commands.
I strongly believe there should be some kind of group, whatever you call it (e.g. comitee), that would work on defining AGS scripting standart. I do not think that coders should do that. This has to be done by people very experienced in using AGS and developing games. These people should determine the general way the AGS should involve, scripts in particular.
While it is technically very easy to add new script commands, this should not be done without a plan in mind. Since AGS allows to write your own extension functions and script modules there must be a criteria to distinct script commands that should be incorporated into engine and which to be rather left for user modules.