I really would like to have the option to enable specific buffs or just buffs under <15sec to be displayed left to the destination frame. I have to keep up 3 Stacks with my Pet Hunter for the 9% Crit buff and this would help a lot to have it visually right in front of me. Its a pain watchin always the top right for it and then gettin set to refresh it.

That is actually already possible with the Custom Buff Arcs:

Please check if that works for you.

Yes you re suggestion works, but my problem with this is, that it shows me when i reached 3 stacks but i want to know the duration of the buff. Like a decreasing Arc for that 8 Seconds. Is that also Possible? On the down right from the arc is the symbol and a really small number for the duration but its already to small to read when infight. An Arc Option for the time would be much more suitable in this case.

That works, too: Untick "Use stack applications" and set "Maximum size" to 1:

If you want to display the stack size in the small icon below the arc, tick "Display stack applications".

Any suggestions to improve the tool-tips and name of the options are welcome if they are confusing

Thats it! Thanks a lot, now i know how to configure even more with this pure genius addon, Thanks!