Tvheadend

Hi...
I'm trying to restrict the maximum number of channels to be streamed by TVH for different reasons, CPU resources and available decrypting CAs constraints. I'm using a QUAD dvb-s2 sat-ip server but I have more users connected than lines/resources available to support with TVH.
The issue is with TVH I can't restrict to use only one tuner per channel, because those channels sharing frequency use the same tuner. In the same way although I limit max number of connections per user to 1 I would be already exceeding the CAs available. There are some workarounds for doing it with Oscam, but none of them seems to be efficient, because they are based in time restrictions to provide ECMs which causes you are not able to change channels quickly when needed.
All the clients streams are setup to use HTSP, Is there any way to define a maximum number of HTSP streams to be provided by TVH for all the users, without taking in account DVR recordings?.
Regards,