Alright here's some of my help
1. The only way I would use the AVI object would be too place it so the controls are out of the view. But the best way would be to use python. Im not that familiar with python but I do know that you can display videos with it. You would have more control over how the player is and all.
2. Im not sure what you mean here. But im thinking its more to do with the camera. I would get the plugin MagicCam you can do wonders with it. Very easy to set up has a example so this should help if this is the problem. http://www.scirra.com/forum/viewtopic.php?f=33&t=7550
3. If you look here you can see what I did with the minimap. http://www.scirra.com/forum/viewtopic.php?f=3&t=7787 I am having problems with it too. You can texture the background using events and for objects you can set different colors but you can't set different sprites. And for a frame just make a sprite with a a place for the minimap and have that sprite part of the hud with the minimap in front or in back of it.
4. Do mean like having a drop down menu? Like you click on the bottom edge of it or something and it slides down? If so use something like Custom Movement. Have it move and a slow speed towards a invisible object on the hud.
5. Im not sure really how to do this. Would be nice if a cap was released for it but Im not sure.
6. http://www.scirra.com/construct/demos.php There is one for Plasma and one for particles. Theres example files for both so you can look how they are made. I haven't really got into those yet so i don't have much info on them.
7. Under behaviors there is one called Wrap this is what you want
8. I don't know. There no info really that I found about this.
9. From what I understand from it that its like something you can draw on. either by events or setting a brush like tool up.
10. Seems to me like it copy's what the other object it is paired to does. So if object 1 jumps the other object jumps with it. Not really sure other then that.
11. I also wondered what this is too. I don't anything about it.
12. I have read on the forums that a way to do this is to basically have it a random thing. Like random predict what they did. Other way would be too have it running in the background and then saving it to a file to be opened when your on the other layout. I wouldn't even know how to begin with this.
13. Depends if its topdown its a little more work then side scroll. Maybe make a invisible wall? so the player can pass? About random islands I am clue less how to get it to generate. I read here of the forum before of a guy with a I believe a python script that generated stuff like that. But I wouldn't know how. And I don't know of anywhere on the site were its explained.
14. If you ever play some of the newer FPS you see that if you turn fast that the screen kinda blurs. Or even like if you turn you head fast it kinda blurs. Same thing
15.Post in Construct Discussion forum a feature request. And you might see in a a version of construct.
16. Write it to a file I would suggest a encrypted one so that people don't edit for there gain lol. Im not sure much on this yet as I haven't tried it but I know its possible.
17. IF you have the mouse and keyboard object in your layout. Under events have it disable the cursor and then have a image of your chose on ever tick positioned at the mouse. Make sure you have the image hotspot at the point were you want to click.
18. I am not sure about this i haven't tinkered with the particle system yet.
19. Not sure how to do that from it being pitch black to some light just not showing objects. Only way I could think of is to using lights but i would image have all those lights would slow the game down.
20. Its a graphics bug try making the tiles a different size and see if that helps.
21. Here is a great place to read about them http://sourceforge.net/apps/mediawiki/construct/index.php?title=Bone_Behavior
22. Nope the only way would be to test each one. Sounds bad I know lol there's alot. But right now there nothing really telling you what they do or showing you.
Hope this helps some if you need anymore help feel free to ask