K-Relay basically provides a proxy for you and "mini-scripts" that make your life much easier. Such as tping tp player with only "/tp <name> (teleport can now be shortened), auto-ability, etc. Just checkout all the plugins for it. There is a multi-boxing plugin made by jex4334, --->
here: https://www.mpgh.net/forum/showthread.php?t=1008375
Although it is only beta, and buggy/glitchy, and only supports 2 clients.
Hope this helps!