thanks for answering.
I will ofc not subscribe to being pro isboxer user but what i know covers my 5 boxing wow, 7boxing eve onilne etc.
1 - if i for example make a hot key for STO saying when i press key X it sends key Y, if i make that kind of button and inclue send to all and happen to for example move the mouse at the same time the main window will freeze.
2 - to get around that i tried to make all my important buttons include a "shift" or "alt" combo, ie, when i press X it sends "shift y" the other windows do not register the "shift" part, ironically it recives an upper case Y but the "shift" or "alt" signal gets lost, ofc if i press the combo locally it works
3 - i removed all keymaps and white/blacklist just to test simple keyboard repeat (not mouse) it would send 1-2 key presses then it would stop sending, if i then clicked each windows keyb repeat would work for 1-2 key presses but then stop, OBS on the main windows it was np, but on the 4 slave windows it didnt work.
As I said I will not subscribe to being ISboxer pro and by now my work around is to make sure anything i do is only sent to the slaves not the main window and it kinda works pretty good due to the way STO works with alot of automation.
I have tested this on 2 separate computers, with all clients on one pc but also splitting the clients between 2 comps and i run into the same problems how ever i do this and the freeze is pretty malign where i have to kill the process in the task manager.
Still ISboxer is a pretty nifty tool for 5 boxing STO but thats more because of how easy sto's user interface is.
Lastly this might be due to some compatible issue with my pc's and since i found workarounds im pretty content and i fully understand STO wont recive the same attention as f ex WoW