1. You can use ONE var to store whole reply, like " set %x %x %user with %user_points"
2. You can use "set -u10 %checker" for:
2.1 if %x is empty - you set %x with new reply and set -u %checker
2.2 if %x is not empty and %checker exists - add new reply to %x (see 1.)
2.3 if %x is not empty and %checker do not exist (expired after -u secs) - post %x to channel and set %x $null.
