Option delay enhancement

[Rand0x]

Is your feature request related to a problem? Please describe.
I'm always frustrated when I want to do 3 requests per second instead of 1:
--delay 0.5
--delay 0.33
--delay 1.2
--delay 0.1

Describe the solution you'd like
Make it possible to adjust the delay time better for each request.

Describe alternatives you've considered
SQLMAP has this feature.

Additional context
Trying to do "--delay 0.2" it says invalid value