i know with the tasks module i can freely move around tasks on the screen
i dont want that and it can be disabled it seems

but what i wonder about is if i can swap the position of 2 tasks
like in firefox or xtaskbar for example
rearranging tasks

Unfortunately "not really". You can disable "auto arrange", and manually reposition them. You can also set TasksSort which will sort by class/title, essentially grouping similar tasks together. Not sure if that is why you were wanting to do that or not.

no i just tend to move 2 tasks that im working with next to each other

another question...
is there no possibility to define a max taskbar width?
if i open enough tasks they go off-screen for me

From the docs...take your pick...

TasksWrapCount 0
- Sets the maximum number of tiles that can be
displayed in one direction, before wrapping.
- accepts any positive integer or the following:
Set to 0 to disable.
Set to -1 to autowrap.
- defaults to: 0

TasksMaxTiles 0
- Sets the maximum number of tiles that can be
displayed.
- accepts any positive integer. Use 0 to disable.
When disabled, the maximum is limited by your
system memory.
- defaults to: 0

i know but i dont want to limit the tiles or wrap them
i want them to resize if a specific taskbar width is reached
so not possible?

Not with Tasks no...

thanks
guess i have to wait for a xtaskbar fix

If you just need to work with two tasks, just leave auto arrange enabled, and drag the two specific tasks into a "working area" or something that you could design into your theme. Put a small button next to that area that binds to !TasksGather, so when you're done working with those two specific tasks, just click the button, and everything goes back to normal.