Question about GAMG solver strategy (only V cycles currently)

Functionality to add/problem to solve

I checked the source code of GAMG solver and found that there is only V cycle for multi-grid. From some literature it said that F and W cycly may convergence faster thant normal V cycle. My question is: why not add F and W cycle as an alternative? What are your worries? (Brief scope)

Target audience

GAMG are mainly used in solving matrics of pressure field and as I know it is always hard to convergence and costs much time in the whole solving proccess. So everyone who uses GAMG solver may nenifit from the changes. (Who will benefit from the changes?) (What type of cases?)

Proposal

Add W and F cycle of multi-grid series solver. (How are we going to solve the problem?)

What does success look like, and how can we measure that?

add alternative cycles and api to let user choose own cycles. (What are the success factors and acceptance criteria? e.g. test cases, error margins)

Links / references

https://en.wikipedia.org/wiki/Multigrid_method (Links to literature, supporting information)

Funding

(Does the functionality already exist/is sponsorship available?)