I'm assuming it's the same setup for all apps he wants to use this new modifier sticky feature with. So, no, it does not mean that he might as well map it to the default profile, if he's using it how I think he is.
If it's all the same setup for those buttons (e.g. MButton=Alt, Button4=Ctrl, Button5=Shift), then mapping those to all apps he wants this feature to work on + the OSK may enable him to keep "Enable profile switching on mouse move" active. I think that option is a good one to have checked.
I was just offering an alternate method for khold to use that may not require turning off that feature. Not suggesting that any new feature be added... or anything be removed.
I understand that turning that feature off is a current solution for khold, but he may find that the method I suggest still works out for him
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+ the bonus that profile switching would still be enabled for all his other uses.
P.S.
If khold is assigning completely different buttons for each app he's using this typing feature in, then my method/suggestion won't do. The button assignments I gave above are just an example, I obviously don't know his exact setup.
![Very Happy :D](./images/smilies/icon_biggrin.gif)