Avoid to delete 2 messages on one fn+Backspace press?

Question

I work on PowerBook 15" and didn't have Delete key.
So I use fn+Backspace to make a forward delete or delete message from Mail.app. But sometimes (uhm... often enought to stop using keyboard) Mail.app deletes 2 message. One I want to and next one. If I use toolbar icon - this never happens.
I have
IMAP mailbox,
Key repeat rate = Fast,
Delay until repeat = third tick from Short (but belive me - I press fn+Backspace VERY fast )))),
Mail.app 2.0.7 (746.2/750),
Mac OS X 10.4.6 (8I127)
what else may be interesting?

Answer 1

Without deleting message:
"Move to next message in thread--Down Arrow key
Move to previous message in thread--Up Arrow key"
From Mail Help.
To be safe, then continue to use the "Delete" toolbar icon to delete your messages. That would be safer for you.
You might set your Key Repeat Rate at a lower setting instead of at Fast. The Delay rate sounds OK. You might just try slowing down a bit over all, thereby making fewer keyed stumbles. Sometimes working the keyboard too fast, can cause mistakes that we would not normally encounter if we worked it at a slower rate, and having fewer mistakes. Just a though. <)$:~) <br>
iMac 1.9 GHz PowerPC G5 1.5 GB DDR2 SDRAM   Mac OS X (10.4.6)   Slot Loading 8X Dual Layer SuperDrive, iSight & Apple Remote; iPod Video