[Prusa XL Toolchanger] Unchangable Dwell time setting on toolhead change causes blobs on print

[Stippy19]

Description of the bug

After completing a layer in one color, the toolhead freezes for a little over a second before parking the head. In this time, the toolhead may* stay on the printed part, causing blobs by oozing filament. This seems to be caused by "G4 S1.500 ;" command in the CP TOOLCHANGE START block. However, it does not seem to be able to somehow change that by any settings in the slicer.

*Additionally to this setting not being changable: Using two toolheads, the first toolhead goes to the wipe tower, then does the 1.5s dwelling and then docks that toolhead while the second toolhead does the dwelling on the printed part and then is docked directly. I am not sure, if there is another option in the slicer I am missing for that.

Issue originally found by reddit user "finestaut", just matching my issue I had the same day. I am just writing his findings here, to be sure it's seen for Slicer development.
Link

Project file & How to reproduce

Basically every project using multiple toolheads. Example: case_no_toggle.zip

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

2.9.0

Operating system

Windows 10

Printer model

Prusa XL

[Mike-Flexicon]

I have fixed mostly fixed this with custom code in the "tool change G-code" It drove me crazy that one head would go immediately to the wipe tower and the other would go to the part.. dwell.. then go to the wipe tower. This code fixes that for me, besides having to update the location of the wipe tower when it's moved.

Printer: Modix Big-60
Firmware: RepRap
Board: Duet 2 wifi with duex
Physical Extruders: 2

My custom toolchange G-code:
{if next_extruder == 0}
G91
G0 Z5
G90
G0 X474 Y346 F4800 ; Go to Wipe tower. This should be a parameter instead of having to update it when I move the wipe tower
G91
G0 Z-5
G90
T0
{else}
T1
{endif}