Would it be possible to add an option to show cooldowns in seconds only (ie: instead of 1:10, it would say 70, or instead of 2m it would say 120). A couple of friends and myself we're trying to figure out the options to do this, but were unable to find any.

Agree! Really good idea!

Here is a temporary fix. This changes the format from mm:ss to seconds, if the time is below threshold.

In /OmniCC/core/timer.lua, line 214
return L.MMSSFormat:format(seconds / MINUTE, (seconds % MINUTE) / SECOND), sleep
change to
return seconds / SECOND, sleep