Speed up/down portion of CW message #491

It would be great if we could setup a speed up or down "flag" on the CW messages memory/macros.

For example say I have my key set to 26 WPM and the following macro:
CQ CQ CQ DE <MYCALL> <MYCALL> <dwn20><MYCALL> </dwn20> K
so to make the software slow down the speed when sending the callsign last time.

Or if I if slow:
<DXCALL> <RSTN> <up24> <RSTN> </up24> K
so it will solow down for that specific report.

Could be with a specific speed (like <26wpm> or specifying a speed change (up5wpm).

CQrlog does it by + or - sign in the macro:

+ or - in macro text will increase/decrease CW speed by 5WPM/one mark.
"TU +++599--- 001" will send 599 with 15WPM higer speed.