Thanks for reporting
These are the allowed actions for !addpattern:
[-a<actions>] A number defining what action to take:
0 Allow (can only be used in combination with replace)
1 Ignore
2 Notify user
4 Warn user
8 Mute user
16 Disconnect user
32 Kick user
64 Ban user
128 Redirect user (uses the redirect address from: !set rd_flood)
One of the values above (except 0) can be combined with one or more of the following:
256 Notify Opchat
512 Lock Mainchat (use with caution)
Here's the catch: you can only choose one action from number 0-128, and combine it with 256 and/or 512.
I'll add a check in !addpattern / !modpattern to let the command fail if numbers between 0 and 128 are added. To prevent flooding feed, you could choose option 32 instead..