Couple of image suggestions

[DustyPorViva]

1) I've suggested it before but I'd still like to see it happen: allowing negative input to stretchx/y. This would flip the image when under 0. So stretchy=-1 would be a vertical flip of an image. Right now there is rotating of images, but no flipping. Why not?
2) changeimgvis also allowing negative input. This would show images under the tileset. Please... pretty please?

3) not a suggestion, but a bug of sorts. Rotating any gani, whether it be a player object or showimg object, will distort its position. This is not apparent on gani's such as idle, walk, push and such, but try rotating a gani and setting it as sword. Its position gets all screwed up.