1. Can be fixed by checking over your events and scripts and whatnot. It's caused by conflicting event commands or lines of the script. Try using a different event method in the case of events or check for an invalid syntax use in case of a script error.

2. Add the dimensions of the two tilesets, make a new image in gimp, photoshop, GraphicsGale, or whatever image program you are using for image editting. The dimensions of the new image should be enough to fit the two tilesets. Copy one, paste it into the new image, copy the other and paste that into the image. Make sure they are not overlapping.

3. ... I'm not sure how exactly to do that. I'm sure there is an event command out there for timed events. ALTHOUGH, there is a script I know of to do that.

4. Scripts have been made, and if you are not illiterate and have a bad keyboard, I believe anyone could script said script.

5. What? You want sprites for the sprites they provide? Or do you mean templates in the same 4x4 dimensions? Learn to sprite, it's easy. Pixel art does not require artistic talent, but common sense and patience.

6. Make one? That's how they got on google in the first place.

7. Holding down control to pass through unpassable tiles is only in the testplay. If you make an encrypted project, as I suggest for all COMPLETED games, as noone can access the files, steal your sprites, scripts whatnot. What encrypting a file does is makes a single .exe file and does what using a RUBY compiler does, it condenses all of your expansive events into mere bytes of text. =D that's why I'm learning how to make games straight into a ruby compiler, not using RMXP, as the event's limit what you can do, and adding additional script can cause messy errors within the existing script.

I'm hoping that helps you, but if you can't find something, my best advice is to make it yourself.