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I wouldn't know how to do it myself, but it is possible to fix the Su-22 even if the original creator has long-since moved on. Someone published a fix for a similar ground physics issue affecting BWI's T-6 / Super Tucano mod, and both seem to work fine. Someone also fixed the IFA3 planes which also had the 'ghost taxiing' issue.
Short-term fix: creative use of Advanced Towing means you can pull the SU to the runway, and use a truck to keep it in place long enough to board.
Just a heads up, love your missions!
http://gtm.steamproxy.vip/groups/RobJA3
Use Steam and not this shit of Six.