All important extensions are accessible for everybody in the Extensions Manager,
they can be found online and some extensions are only available to the purchaser.
You know your extensions and if another person has any issues with missing objects, you can always explain where to find and how to install the required extensions. In addition it's not very difficult or time intensive to do backups of your project extensions manually.
A new automatic solution would only offer limited benefits and the realization of an intelligent solution is probably too cumbersome for various reasons.
Copy & Paste a group = worked 46 times in a row. Stopped working. Close game - reopen game - can carry on.
Copy & Paste - several events together = worked 46 times in a row. Stopped working. Close game - reopen game - can carry on.
But I think this was fixed in update 290 - then re-appeared in update 291 and continues into update 292...
Hmm, this is not mentioned in the change log of the build 290. In 289 there is "- Event List editor: Paste randomly not working." but I guess it's a different problem.
Do you have an example where this can be reproduced every time?
I can't create it on demand - it's random - I haven't been able to find a specific trigger for it either. (I tried to recreate it now but got a whole row of little red bugs in the copy / paste process ...I thought you'd exterminated them all ... I guess not.)
If it helps:
The red bugs seemed to be created when I was copying and pasting code relating to actives I had previously had on that level but had deleted (because I don't need them - but when I copy & paste code again from higher levels - they're there until I delete those parts again.)
The copy & paste issue happened a few times yesterday when I was specifically copying and pasting groups I had previously copied and pasted - or a sub-group of a group I had previously copied & pasted - it happened frequently then. I'll see if it happens again if I can go back to one prior save of the game (backup) and recreate it.