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Yes as long as the VOC does not exceed the limit. The ITTF only regulate the VOC (which dispersed by speed glue). Most boosters use non volatile oil so it is fine.
This is not correct, boosting is not allowed. Check ITTF rules
2.4.7 The racket covering shall be used without any physical, chemical or othertreatment.
2.4.7.1 Slight deviations from continuity of surface or uniformity of colour due toaccidental damage or wear may be allowed provided that they do notsignificantly change the characteristics of the surface.