I found out it would help me a lot if I could set download limit (mb, gb) for Rapidshare premium account in one hour or day. For example if there is 5gb daily limit on rs, I want to set jdownloader to download only 2.5gb in one day (therefore before rs limit is reached) and then deactivate usage of premium account and switch to free mode. This way I do not have to supervise jdownloader when specified amount of traffic has been reached and can automatize even more download processes.

I hope someone will find this request useful and implement it asap.

If you can calculate how much you can download per time unit, you could use the Schedule add-on of jD. With this add-on you can set the times for enabling and disabling premium downloads.

You'll find the Schedule add-on in Settings -> Plugins & Add-ons -> Extensions.

[Jiaz]

you dont need to supervise jd as it handles premium/free user switching itself.
if traffic is expired it will switch to free user mode and checks regulary if you have new traffic (eg every 24h on rs)