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Don't know if mirror locking is really needed. A Starizona 10:1 fine focuser will focus well and stiffen the mirror travel significantly.
An SCT focuser may be a good call, especially if you image. The cheap option is simply a Meade motorfocuser + a Shoestring PCFC adapter. If you are moving a heavy load - go the full hog and get a Moonlite focuser with high precision encoders and computerised control. I have both these options on C9.25 the Meade and the Moonlite on a Williams Optics 110mm FLT. The Moonlite focuser just laughs at heavy payloads whilst the Meade struggles.
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