No this will be a feature of the scheduler. Also have you tried setting a maximum number of tries per proxy? That can help with that kind of issues.

Can't fix that, sorry xD

Untick the auto redirect and do the redirections manually so you have total control

The fact that it changes all the time probably means that a csrf code or unix timestamp is mixed in to create the hash. You will have to look through the javascript of the website, hoping it's not obfuscated. I cannot help more, sorry.

The syntax of your SET command is wrong. Also you want to do this:

IF "<MYVAR>" EqualTo ""
SET STATUS CUSTOM "Free"
ELSE
SET STATUS SUCCESS
ENDIF

Another way would be to untick the "create empty" checkbox in the parse block and the IF statement will become

IF "<MYVAR>" Exists
SET STATUS SUCCESS
ELSE
SET STATUS CUSTOM "Free"
ENDIF

which in my opinion is more readable.

What's a double dot? Do you mean a colon? I'm not sure you can do that.

You can use the command SET USEPROXY TRUE/FALSE or something, go read the documentation it's all there.

I don't understand, but I'm guessing you need to take a look here https://forum.openbullet.dev/topic/7/how-to-loop-on-a-list-variable/12

Please at least do some research before posting questions.
https://forum.openbullet.dev/topic/8/environment-ini-a-common-problem/6

No I meant meinname probably opened one a couple months ago