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I'm running Flexi-HAL and it doesn't support DMA and wanted to know what the best route to take to get there. I need 250KHz for my CNC. It uses a STM32F446RE.

Reviewing the documentation, I noticed that there are two functions that can be used to set values associated with key codes, set_rapidrate() and set_feedrate(). Is there a corresponding function to set the jog speed such as set_jograte()?

heaven wrote:

One more problem, LinuxCNC is using 3-axis (xyz) readahead, so if you are using xyz+(abcuvw) axis blending in G-code command, the speed will be very slow

That will depend on the G-code. The slow motion in combined moves is to do with the requirement in the simple path planner that the system can stop in the next segment (if it turns out to be the last segment, because without lookahead it can't know what the allowed exit speed is for the current segment) 
If the G-code is very short segments, this becomes a limit to the speed. But if the moves are long, the system can run at full speed. 
 

You could try Geany (which we include in the LinuxCNC distribution because it's quite a well-behaved editor)