Can you add some "switches" that can be pressed while miner is running to change for example intensity on go or gridsize or some other things?
To don't have to restart miner..

just asking ..

Yes, it is already on my list and will come in one of the next releases - some other user already suggested that.
On easy thing that you can do to improve you hashrate quite a lot is to improve the cooling of the GPUs. This can easily bring you additional 5-10% - maybe you already noticed that a cold GPU performs much better than a hot one.
Whilst this is quite common knowledge, I think it only really starts making a difference if your GPU is around 75-80C and above.
Don't think I've actually seen any performance degradation from a few degrees difference while one's cruising under 70 (where most undervolted Pascal cards should sit quite comfortably).