game-editor.com

It's terrible when I've made a path and then I realise that it's too slow and I can't change how many frames there are.

The 2nd thing, I would like possibility to edit timers.

I agree, those are two problems that I've had in the past. More control over both those areas of GE would be a great help.

If you create the timer in script editor, you can change the time on the end. On the timer action, it still says the time it was originally created for, but is actually the different one. This works individually for actors, so it won't change it for all actors.