Time-Out with decimal precision

Its possible to set the timeout with decimal precision e.g 2.5s ?

When i Tried to make timeouts in my script

web_set_timeout("STEP","2.5");
web_set_timeout("CONNECT","2.5");
web_set_timeout("RECEIVE","2.5"); 

I have error:

Action.c(6): web_set_timeout started   [MsgId: MMSG-26355]
Action.c(6): Error -27288: The "2.5" argument (number 2) does not specify a valid number   [MsgId: MERR-27288]
Action.c(6): web_set_timeout highest severity level was "ERROR"   [MsgId: MMSG-26391]