forward slips on a jet safe ??

[PEI_3721]

P A Re “may do other bad things”.
Not necessarily so. These aspects are tested during type certification and if encountered, any serious problems would probably define a side slip limit short of the aerodynamic limit. Of course there can always be exceptions and some aircraft may have AFM limiting or warning statements for the systems affected so that the full ‘aero limit’ can be used. Also see aircrafts’ limit re Va – max speed for full scale control deflection.

There should not be any structural problem up to the limiting sideslip angle (possibly defined by physical rudder limit / airspeed schedule). As with other structural limits there is a margin of safety, but historically, the rudder requirements did not fully cover reversed or high dynamic forces; thus most aircraft manufacturers publish warnings / advice on these subjects.

AIC P 85 2008.
IFALPA Safety Bullletins 2002.

P.S. Engine limit more likely to be encountered in a crosswind take off, if so, then the aircraft may have to conduct a rolling take off, with full power only being applied at some predefined airspeed.